Mathematics for IGCSE & O level - Ratio And Proportion (Section 1 - No. 41)
In a class, the ratio of students who like math to those who like science is 5:3. If 15 students like math, how many like science?
6
9
10
25
Vysvetlenie
Math:Science=5:3. 15/5=3, so, science=3*3 = 9