Question

John had a sum of money. He spent $132 on a computer software and 3/4 of his
remaining money on 5 indentical books. The amount he had left wa equal to 1/6 of his
money. How much did each book cost?

Answer 1

x - 132 - 3/4 (x-132) = 1/6 x
find x, and then each book cost 1/5 * 3/4 (x-32)

Answer 2

(3/4)(S-132) = 5 B
[(S-132) - 5 B ](1/4] = (1/6) S

3 S - 396 = 20 B
6 S - 792 - 30 B = 4 S

3 S - 396 - 20 B = 0
2 S - 792 - 30 B = 0

6 S - 792 - 40 B = 0
6 S - 2376 - 90 B = 0
- 1584 + 50 B = 0
B = 1584 / 50 = 31.68