Betty's salary to Yoko's salary is 4 : 7. If Betty spends
47 of her salary, Yoko will have $2590 more than her. How much salary does Betty have?
| |
Betty |
Yoko |
Comparing Betty
and Yoko at first |
4x7 =
28 u |
7x7 =
49 u |
Before |
7x4 =
28 u |
|
Change |
- 4x4 =
- 16 u |
|
After |
3x4 =
12 u |
49 u |
Comparing Betty
and Yoko in the end |
|
$2590 more |
Betty's salary at first is repeated. Make Betty's salary at first the same. LCM of 4 and 7 is 28.
Amount that Yoko will have more than Betty in the end
= 49 u - 12 u
= 37 u
37 u = 2590
1 u = 2590 ÷ 37 = 70
Betty's salary
= 28 u
= 28 x 70
= $1960
Answer(s): $1960
