Risa's salary to Erika's salary is 5 : 9. If Risa spends
37 of her salary, Erika will have $1290 more than her. How much salary does Risa have?
| |
Risa |
Erika |
Comparing Risa
and Erika at first |
5x7 =
35 u |
9x7 =
63 u |
Before |
7x5 =
35 u |
|
Change |
- 3x5 =
- 15 u |
|
After |
4x5 =
20 u |
63 u |
Comparing Risa
and Erika in the end |
|
$1290 more |
Risa's salary at first is repeated. Make Risa's salary at first the same. LCM of 5 and 7 is 35.
Amount that Erika will have more than Risa in the end
= 63 u - 20 u
= 43 u
43 u = 1290
1 u = 1290 ÷ 43 = 30
Risa's salary
= 35 u
= 35 x 30
= $1050
Answer(s): $1050
