Jen and Shiyun went shopping. After Jen spent $55
c, Shiyun had 3 times as much as Jen. If Jen had $21
c more than Shiyun at first,
- Express the amount of money that Jen had at first in terms of c.
- If c = 25, find the amount of money that the two lady had left after shopping.
|
Jen |
Shiyun |
Before |
1 u + $55c |
3 u |
Change |
- $55c |
|
After |
1 u |
3 u |
(a)
1 u + 55
c = 3 u + 21
c3 u - 1 u = 55
c - 21
c2 u = 55
c - 21
c = 34
c1 u = 34
c ÷ 2 = 17
c Jen's amount at first
= 1 u + 55
c = 17
c + 55
c = $72
c (b)
1 u + 3 u = 4 u
4 u = 4 x 17
c = 68
c Amount the two lady had left
= 68 x 25
= $1700
Answer(s): (a) $72
c; (b) $1700