Zoe's salary to Betty's salary is 7 : 9. If Zoe spends
25 of her salary, Betty will have $720 more than her. How much salary does Zoe have?
|
Zoe |
Betty |
Comparing Zoe and Betty at first |
7x5 = 35 u |
9x5 = 45 u |
Before |
5x7 = 35 u |
|
Change |
- 2x7 = - 14 u |
|
After |
3x7 = 21 u |
45 u |
Comparing Zoe and Betty in the end |
|
$720 more |
Zoe's salary at first is repeated. Make Zoe's salary at first the same. LCM of 7 and 5 is 35.
Amount that Betty will have more than Zoe in the end
= 45 u - 21 u
= 24 u
24 u = 720
1 u = 720 ÷ 24 = 30
Zoe's salary
= 35 u
= 35 x 30
= $1050
Answer(s): $1050