Roshel's salary to Xuan's salary is 3 : 7. If Roshel spends
57 of her salary, Xuan will have $3870 more than her. How much salary does Roshel have?
| |
Roshel |
Xuan |
Comparing Roshel
and Xuan at first |
3x7 =
21 u |
7x7 =
49 u |
Before |
7x3 =
21 u |
|
Change |
- 5x3 =
- 15 u |
|
After |
2x3 =
6 u |
49 u |
Comparing Roshel
and Xuan in the end |
|
$3870 more |
Roshel's salary at first is repeated. Make Roshel's salary at first the same. LCM of 3 and 7 is 21.
Amount that Xuan will have more than Roshel in the end
= 49 u - 6 u
= 43 u
43 u = 3870
1 u = 3870 ÷ 43 = 90
Roshel's salary
= 21 u
= 21 x 90
= $1890
Answer(s): $1890
