Zoe's salary to Cathy's salary is 7 : 9. If Zoe spends
25 of her salary, Cathy will have $1440 more than her. How much salary does Zoe have?
| |
Zoe |
Cathy |
Comparing Zoe
and Cathy 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 Cathy in the end |
|
$1440 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 Cathy will have more than Zoe in the end
= 45 u - 21 u
= 24 u
24 u = 1440
1 u = 1440 ÷ 24 = 60
Zoe's salary
= 35 u
= 35 x 60
= $2100
Answer(s): $2100
