Cathy's salary to Irene's salary is 2 : 7. If Cathy spends
56 of her salary, Irene will have $800 more than her. How much salary does Cathy have?
| |
Cathy |
Irene |
Comparing Cathy
and Irene at first |
2x3 =
6 u |
7x3 =
21 u |
Before |
6x1 =
6 u |
|
Change |
- 5x1 =
- 5 u |
|
After |
1x1 =
1 u |
21 u |
Comparing Cathy
and Irene in the end |
|
$800 more |
Cathy's salary at first is repeated. Make Cathy's salary at first the same. LCM of 2 and 6 is 6.
Amount that Irene will have more than Cathy in the end
= 21 u - 1 u
= 20 u
20 u = 800
1 u = 800 ÷ 20 = 40
Cathy's salary
= 6 u
= 6 x 40
= $240
Answer(s): $240
