Which fraction is the largest?

A 1/2

B 4/5

C 5/8

D 7/10

E 9/40

Correct Answer: Option B

Fractions are:- 1/2, 4/5, 5/8, 7/10, 9/40

Taking LCM of all the denominators we get

LCM of 2, 5, 8, 10, 40 = 40

So making all the denominator equal to 40 and multiplying the numerator accordingly, we get

20/40, 32/40, 25/40, 28/40, 9/40

And then comparing the numerators we see that 32/40 is the largest of all thus 4/5 is the largest.