Question

A boy was trying to find 5/8th of a number. Unfortunately, he found out 8/5th of the number and realized that the difference between the answer he got and the correct answer is 39. What was the number?

Answer 1

Answer:

Step-by-step explanation:

Let the unknown be x

(8/5)x - (5/8)x = 39

8x/5 - 5x/8 = 39

Find the LCM of the denominators

LCM is 40

64x - 25x = 39

—————

40

64x - 25x = 39 x 40

39x = 1560

x = 1560/39

x = 40