Question

which of the numbers 4, 5, 6, 7 or 8 when placed as a denominator in the fraction 17/?, gives a result closest to 2 1/2

Answer 1

if we try all the numbers then we'll have:
17/4 = 4.25
17/5 = 3.4
17/6 = 2.83
17/7 = 2.42
17/8 = 2.12

the closest number to 2 1/2 would be 2.12
which is 17/8.