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JAMB Mathematics 1988 Question 2

Question 2

Fractions, Decimals and Approximation

If x is the addition of prime numbers between 1 and 6; and y the H.C.F. of 6, 9, 15, find the product of x and y.

  1. A.27
  2. B.30
  3. C.33
  4. D.90
Show the answer and explanation

Answer: B (30)

Explanation

The primes between 1 and 6 are 2, 3 and 5, so x = 10. The HCF of 6, 9 and 15 is 3. So xy = 30.