John and Lee were given some allowances each. If John spent $14 each day and Lee spent $42 each day, John would still have $2169 left when Lee spent all his allowance. If John spent $42 each day and Lee spent $14 each day, John would still have $41 left when Lee spent all his allowance.
- How much allowance did John receive?
- How much allowance did Lee receive?
|
Case 1 |
Case 2 |
|
John |
Lee |
John |
Lee |
Before |
1 u + 2169 |
3 u |
3 p + 41 |
1 p |
Change |
- 1 u |
- 3 u |
- 3 p |
- 1 p |
After |
2169 |
0 |
41 |
0 |
(a)
Simplify the ratio.
14 : 42 = 1 : 3
The allowance that Lee had at first is the same for Case 1 and Case 2.
1 p = 3 u
3 p = 9 u
The allowance that John had at first is the same for Case 1 and Case 2.
9 u + 41 = 1 u + 2169
9 u - 1 u = 2169 - 41
8 u = 2128
1 u = 2128 ÷ 8 = 266
Allowance that John received
= 1 u + 2169
= 266 + 2169
= $2435
(b)
Allowance that Lee received
= 3 u
= 3 x 266
= $798
Answers: (a) $2435; (b) $798