35 of Eric's savings comprised of 5-cent coins and 10-cent coins. Eric used some 5-cent coins to purchase a glowstick. The number of 10-cent coins left was 50% more than the number of 5-cent coins left. Given that Eric had 40 more 10-cent coins than 5-cent coins left in the end, find the amount of money Eric spent on the glowstick.
|
5-cent coins |
10-cent coins |
Before |
3x3 = 9 u |
2x3 = 6 u |
Change |
- 5 u |
|
After |
2x2 = 4 u |
3x2 = 6 u |
Fraction of Eric's savings that comprised of 10-cent coins
= 1 -
35=
25Number of 10-cents coins in the end in percentage
= 100% + 50%
= 150%
150% =
150100 =
32Number of 10-cent coins remains unchanged. Make the number of 10-cent coins the same. LCM of 2 and 3 is 6.
Number of more 10-cent coins than 5-cent coins
= 6 u - 4 u
= 2 u
2 u = 40
1 u = 40 ÷ 2 = 20
Number of 5-cent coins spent on the glowstick
= 9 u - 4 u
= 5 u
= 5 x 20
= 100
Amount that Eric spent on the glowstick
= 100 x 0.05
= $5
Answer(s): $5