Question

How can you express (15 + 30) as a multiple of a sum of whole numbers with no common factor?

a)2 × (7.5 + 15)
b)3 × (5 + 10)
c)5 × (3 + 6)
d)15 × (1 + 2)

Answer 1

a) has a non-whole number so cannot be the answer
b) and c) have common factors (5 and 3 respectively)
d) is correct since 1 and 2 have no common factors.