Question

Keith spent 1/5 of this money on a story book. He gave $26.80 to his brother and had 1/2 of his money left. How much money did he have left?

Answer 1

1/5 = 2/10
1/2 = 5/10

2/10 of his money on a story book.
Storybook is the variable x

$26.80 to his brother (5/10 of his money left)

5/10-2/10 = 3/10

$26.80x3/10= 8.04

He had $8.04 left.

Answer 2

Not really sure of this one but i think it's like this- 
2/10 (money for story) + 3/10 (26.80 dollars to brother)= 1/2 of his money
3/10x=26.80  268=3x ; x= 89.33333....
89.33 X 5/10= answer
money left= (roughly) 44.67