Four boys, Jack, Eric, Seth and Charlie saved some money. Eric's savings was
12 of the total savings of Jack, Seth and Charlie. Jack's savings was 30% of the total savings. Seth's savings was
25 of the total savings of Eric and Charlie. If Eric's savings was $400, how much less was Jack's savings than the total of the other three boys?
Eric |
Charlie |
Seth |
Jack |
Total |
1x10 |
2x10 |
3x10 |
7x3 |
3x3 |
10x3 |
5x3 |
2x3 |
|
|
10 u |
5 u |
6 u |
9 u |
30 u |
30% →
30100=
310 Jack's savings : Total savings = 3 : 10
Eric's savings = 10 u
10 u = 400
1 u = 400 ÷ 10 = 40
Jack's savings = 9 u
Savings of the other three boys
= 10 u + 5 u + 6 u
= 21 u
Savings that Jack had less than the total of the three other boys
= 21 u - 9 u
= 12 u
= 12 x 40
= $480
Answer(s): $480