Lucy's salary to Sarah's salary is 2 : 7. If Lucy spends
35 of her salary, she will have $310 less than Sarah. How much salary does Sarah have?
| |
Lucy |
Sarah |
Comparing Lucy
and Sarah at first |
2x5 =
10 u |
7x5 =
35 u |
Before |
5x2 =
10 u |
|
Change |
- 3x2 =
- 6 u |
|
After |
2x2 =
4 u |
35 u |
Comparing Lucy
and Sarah in the end |
|
$310 less |
Lucy's salary at first is repeated. Make Lucy's salary at first the same. LCM of 2 and 5 is 10.
Amount that Lucy will have less than Sarah in the end
= 35 u - 4 u
= 31 u
31 u = 310
1 u = 310 ÷ 31 = 10
Sarah's salary
= 35 u
= 35 x 10
= $350
Answer(s): $350
