Lucy and Mary had the same amount of money at first. After Lucy gave $60 to her niece, Mary had 4 times as much money as Lucy. How much did Lucy have in the end?
| |
Lucy |
Mary |
| Before |
1x4 =
4 u |
1x4 =
4 u |
| Change |
- $60 |
|
| After |
1 u |
4 u |
The amount that Mary had at first and in the end remains unchanged. Make the amount that Mary had the same. LCM of 1 and 4 is 4.
Amount that Lucy gave to her niece
= 4 u - 1 u
= 3 u
3 u = 60
1 u = 60 ÷ 3 = 20
Amount that Lucy had in the end
= 1 u
= $60
Answer(s): $60
