910 of Vincent's savings comprised of 5-cent coins and 50-cent coins. Vincent used some 5-cent coins to purchase a game card. The number of 50-cent coins left was 40% more than the number of 5-cent coins left. Given that Vincent had 40 more 50-cent coins than 5-cent coins left in the end, find the amount of money Vincent spent on the game card.
|
5-cent coins |
50-cent coins |
Before |
9x7 = 63 u |
1x7 = 7 u |
Change |
- 58 u |
|
After |
5x1 = 5 u |
7x1 = 7 u |
Fraction of Vincent's savings that comprised of 50-cent coins
= 1 -
910=
110Number of 50-cents coins in the end in percentage
= 100% + 40%
= 140%
140% =
140100 =
75Number of 50-cent coins remains unchanged. Make the number of 50-cent coins the same. LCM of 1 and 7 is 7.
Number of more 50-cent coins than 5-cent coins
= 7 u - 5 u
= 2 u
2 u = 40
1 u = 40 ÷ 2 = 20
Number of 5-cent coins spent on the game card
= 63 u - 5 u
= 58 u
= 58 x 20
= 1160
Amount that Vincent spent on the game card
= 1160 x 0.05
= $58
Answer(s): $58