Julie and Betty went shopping. After Julie spent $88
s, Betty had 3 times as much as Julie. If Julie had $28
s more than Betty at first,
- Express the amount of money that Julie had at first in terms of s.
- If s = 15, find the amount of money that the two lady had left after shopping.
|
Julie |
Betty |
Before |
1 u + $88s |
3 u |
Change |
- $88s |
|
After |
1 u |
3 u |
(a)
1 u + 88
s = 3 u + 28
s3 u - 1 u = 88
s - 28
s2 u = 88
s - 28
s = 60
s1 u = 60
s ÷ 2 = 30
s Julie's amount at first
= 1 u + 88
s = 30
s + 88
s = $118
s (b)
1 u + 3 u = 4 u
4 u = 4 x 30
s = 120
s Amount the two lady had left
= 120 x 15
= $1800
Answer(s): (a) $118
s; (b) $1800