Mathematics for IGCSE & O level - Number (Section 1 - No. 23)
The HCF of two numbers is 7, and the LCM is 42. If one of the numbers is 14, what is the other number?
3
14
21
28
Uitleg
Using the formula Number 1 * Number 2 = HCF * LCM. Let the other number be 'x'. 14 * x = 7 * 42; x = (7*42)/14; x = 21