Risa's salary to Sabrina's salary is 2 : 7. If Risa spends
34 of her salary, Sabrina will have $390 more than her. How much salary does Risa have?
| |
Risa |
Sabrina |
Comparing Risa
and Sabrina at first |
2x2 =
4 u |
7x2 =
14 u |
Before |
4x1 =
4 u |
|
Change |
- 3x1 =
- 3 u |
|
After |
1x1 =
1 u |
14 u |
Comparing Risa
and Sabrina in the end |
|
$390 more |
Risa's salary at first is repeated. Make Risa's salary at first the same. LCM of 2 and 4 is 4.
Amount that Sabrina will have more than Risa in the end
= 14 u - 1 u
= 13 u
13 u = 390
1 u = 390 ÷ 13 = 30
Risa's salary
= 4 u
= 4 x 30
= $120
Answer(s): $120
