Mary's salary to Gwen's salary is 7 : 9. If Mary spends
35 of her salary, Gwen will have $620 more than her. How much salary does Mary have?
| |
Mary |
Gwen |
Comparing Mary
and Gwen at first |
7x5 =
35 u |
9x5 =
45 u |
Before |
5x7 =
35 u |
|
Change |
- 3x7 =
- 21 u |
|
After |
2x7 =
14 u |
45 u |
Comparing Mary
and Gwen in the end |
|
$620 more |
Mary's salary at first is repeated. Make Mary's salary at first the same. LCM of 7 and 5 is 35.
Amount that Gwen will have more than Mary in the end
= 45 u - 14 u
= 31 u
31 u = 620
1 u = 620 ÷ 31 = 20
Mary's salary
= 35 u
= 35 x 20
= $700
Answer(s): $700
