JAMB - Mathematics (1985)

  • 1
    If three numbers P, Q, R are in ratio 6 : 4 : 5, find the value of \(\frac{3p - q}{4q + r}\)
    Хариулт
    (B)
    \(\frac{2}{3}\)
  • 2
    Arrange the following numbers in ascending order of magnitude \(\frac{6}{7}\), \(\frac{13}{15}\), 0.8650
    Хариулт
    (A)
    \(\frac{6}{7}\) < 0.865 < \(\frac{13}{15}\)
  • 3
    A sum of money was invested at 8% per annum simple interest. If after 4 years the money amounts to N330.00. Find the amount originally invested
    Хариулт
    (D)
    N250.00
  • 4
    In the equation below, Solve for x if all the numbers are in base 2: \(\frac{11}{x}\) = \(\frac{1000}{x + 101}\)
    Хариулт
    (B)
    11
  • 5
    List all integers satisfying the inequality -2 \(\leq\) 2 x -6 < 4
    Хариулт
    (B)
    2, 3, 4
  • 6
    Find correct to two decimals places 100 + \(\frac{1}{100}\) + \(\frac{3}{1000}\) + \(\frac{27}{10000}\)
    Хариулт
    (A)
    100.02
  • 7
    John gives one-third of his money to Janet who has N105.00. He then finds that his money is reduced to one-fourth of what Janet now has. Find how much money john has at first
    Хариулт
    (A)
    N45.00
  • 8
    Find x if log\(_9\)x = 1.5
    Хариулт
    (B)
    27.0
  • 9
    Write h in terms of a, b, c, d if a = \(\frac{b(1 - ch)}{1 - dh}\)
    Хариулт
    (D)
    h = \(\frac{a - b}{ad - bc}\)
  • 10
    22\(\frac{1}{2}\)% of the Nigerian Naira is equal to 17\(\frac{1}{10}\)% of a foreign currency M. What is the conversion rate of the M to the Naira?
    Хариулт
    (C)
    1M = 1\(\frac{18}{57}\)N
  • 11
    Find the values of p for which the equation x\(^2\) - (p - 2)x + 2p + 1 = 0
    Хариулт
    (B)
    (0, 12)
  • 12
    If \(e^{x} = 1 + x + \frac{x^{2}}{1.2} + \frac{x^{3}}{1.2.3} + ... \), find \(\frac{1}{e^{\frac{1}{2}}}\)
    Хариулт
    (C)
    1 + \(\frac{x}{2}\) + \(\frac{x^2}{1.2}\) + \(\frac{x^3}{1.2.3}\) + \(\frac{x^4}{1.23.4}\) + .........
  • 13
    \((\sqrt[4]{3} + \sqrt[4]{2})(\sqrt[4]{3} - \sqrt[4]{2})(\sqrt{3} + \sqrt{2})\) is equal to
    Хариулт
    (A)
    1
  • 14
    In a restaurant, the cost of providing a particular type of food is partly constant and partially inversely proportional to the number of people. If cost per head for 100 people is 30k and the cost for 40 people is 60k, Find the cost for 50 people?
    Хариулт
    (C)
    50k
  • 15
    The factors of 9 - (x2 - 3x - 1)2 are
    Хариулт
    (A)
    -(x - 4)(x + 1) (x - 1)(x - 2)
  • 16
    If 32y + 6(3y) = 27. Find y
    Хариулт
    (E)
    1
  • 17
    Factorize abx2 + 8y - 4bx - 2axy
    Хариулт
    (A)
    (ax - 4)(bx - 2y)
  • 18
    At what real value of x do the curves whose equations are y = x3 + x and y = x2 + 1 intersect?
    Хариулт
    (E)
    1
  • 19
    If the quadratic function 3x2 - 7x + R is a perfect square, find R
    Хариулт
    (B)
    \(\frac{49}{12}\)
  • 20
    Solve for (x, y) in the equation 2x + y = 4: x^2 + xy = -12
    Хариулт
    (A)
    (6, -8): (-2, 8)
  • 21
    Solve the following equation \(\frac{2}{2r - 1}\) - \(\frac{5}{3}\) = \(\frac{1}{r + 2}\)
    Хариулт
    (D)
    (1, \(\frac{-5}{2}\))
  • 22
    Solve the simultaneous equations 2x - 3y + 10, 10x - 6y = - 5
    Хариулт
    (A)
    x = 2\(\frac{1}{2}\), y = 5
  • 23
    If f(x - 2) = 4x2 + x + 7, find f(1)
    Хариулт
    (D)
    46
  • 24
    In \(\bigtriangleup\) XYZ, XY = 13cm, YZ = 9cm, XZ = 11cm and XYZ = \(\theta\). Find cos\(\theta\)o
    Хариулт
    (D)
    \(\frac{43}{78}\)
  • 25
    Find the missing value in the table below
    \(\begin{array}{c|c} x & -4 & -3 & -2 & -1 & 0 & 1 & 2 & 3 \\ \hline y = 4 - 3x - x^3 & 80 & & 18 & 8 & 4 & 0 & -10 & -32 \end{array}\)
    Хариулт
    (C)
    40
  • 26
    The number of goals scored by a football team in 20 matches is shown below
    \(\begin{array}{c|c} \text{No. of goals} & 0 & 1 & 2 & 3 & 4 & 5 \\ \hline \text{No. of matches} & 3 & 5 & 7 & 4 & 1 & 0 \end{array}\)
    What are the values of the mean and the mode respectively?
    Хариулт
    (B)
    (1.75, 2)
  • 27
    If the hypotenuse of right angled isosceles triangle is 2, what is the length of each of the other sides?
    Хариулт
    (A)
    \(\sqrt{2}\)
  • 28
    If two fair coins are tossed, what is the probability of getting at least one head?
    Хариулт
    (E)
    \(\frac{3}{4}\)
  • 29
    The ratio of the length of two similar rectangular blocks is 2 : 3. If the volume of the larger block is 351cm\(^3\), then the volume of the other block is?
    Хариулт
    (A)
    234.00 cm3
  • 30
    The bearing of a bird on a tree from a hunter on the ground is N72oE. What is the bearing of the hunter from the birds?
    Хариулт
    (B)
    S 72o W
  • 31
    Without using table, calculate the value of 1 + sec2 30o
    Хариулт
    (A)
    2\(\frac{1}{3}\)
  • 32
    What is the probability that a number chosen at random from the intergers between 1 and 10 inclusive is either a prime or a multiple of 3?
    Хариулт
    (B)
    \(\frac{3}{5}\)
  • 33
    Find the area of a regular hexagon inscribed in a circle of radius 8cm
    Хариулт
    (B)
    96\(\sqrt{3}\) cm3
  • 34
    If cos \(\theta\) = \(\frac{\sqrt{3}}{2}\) and \(\theta\) is less than 90o. Calculate \(\frac{\cot(90 - \theta)}{sin^2\theta}\)
    Хариулт
    (A)
    \(\frac{4}{\sqrt{3}}\)
  • 35
    A solid sphere of radius 4cm has a mass of 64kg. What will be the mass of a shell of the same metal whose internal and external radii are 2cm and 3cm respectively?
    Хариулт
    (C)
    19kg
  • 36
    PRSQ is a trapezium of area 14cm2 in which PQ||RS. If PQ = 4cm and SR = 3cm, Find the area of SQR in cm2
    Хариулт
    (B)
    6.0
  • 37
    A bag contains 4 white balls and 6 red balls. Two balls are taken from the bag without replacement. What is the probability that they are both red?
    Хариулт
    (D)
    \(\frac{1}{3}\)
  • 38
    Two points X and Y both on latitude 60oS have longitude147oE and 153oW respectively. Find to the nearest kilometer the distance between X and Y measured along the parallel of latitude(Take 2\(\pi\)R = 4 x 104km, where R is the radius of the earth)
    Хариулт
    (A)
    16667km
  • 39
    In a class of 120 students, 18 of them scored an A grade in mathematics. If the section representing the A grade students on a pie chart has angle Zo at the centre of the circle, what is Z?
    Хариулт
    (E)
    54
  • 40
    If a{\(\frac{x + 1}{x - 2} - \frac{x - 1}{x + 2}\)} = 6x. Find a in its simplest form
    Хариулт
    (D)
    x2 - 4
  • 41

    In \(\bigtriangleup\) XYZ, XKZ = 90O, XK = 15cm, XZ = 25cm and YK = 8cm. Find the area of \(\bigtriangleup\)XYZ

    Хариулт
    (C)
    210 sq.cm
  • 42
    In the figure, MNQP is a cyclic quadrilateral. MN and Pq are produced to meet at X and NQ and MP are produced to meet at Y. If MNQ = 86o and NQP = 122o find (xo, yo)
    Хариулт
    (A)
    28o, 36o
  • 43

    In the figure POQ is the diameter of the circle PQR. If PSR = 145o, find xo

    Хариулт
    (E)
    55o
  • 44
    In the figure, GHIJKLMN is a cube of side a. Find the length of HN.
    Хариулт
    (E)
    a\(\sqrt{3}\)
  • 45

    In the figure, PQ is the tangent from P to the circle QRS with SR as its diameter. If QPR = \(\theta\)o and RQP = \(\phi\)o, which of the following relationships between \(\theta\)o and \(\phi\)o is correct

    Хариулт
    (E)
    \(\theta\)o + 2\(\phi\)o