Xuan's salary to Erika's salary is 7 : 9. If Xuan spends
34 of her salary, she will have $3480 less than Erika. How much salary does Erika have?
| |
Xuan |
Erika |
Comparing Xuan
and Erika at first |
7x4 =
28 u |
9x4 =
36 u |
Before |
4x7 =
28 u |
|
Change |
- 3x7 =
- 21 u |
|
After |
1x7 =
7 u |
36 u |
Comparing Xuan
and Erika in the end |
|
$3480 less |
Xuan's salary at first is repeated. Make Xuan's salary at first the same. LCM of 7 and 4 is 28.
Amount that Xuan will have less than Erika in the end
= 36 u - 7 u
= 29 u
29 u = 3480
1 u = 3480 ÷ 29 = 120
Erika's salary
= 36 u
= 36 x 120
= $4320
Answer(s): $4320
