Cindy and Vanessa had an equal number of coins at first. Cindy used
12 of her coins and Vanessa used
18 of her coins. They used 30 coins altogether. How many coins did Vanessa have in the end?
| |
Cindy |
Vanessa |
| Before |
2x4 =
8 u |
8x1 =
8 u |
| Change |
- 1x4 =
- 4 u |
- 1x1 =
- 1 u |
| After |
1x4 =
4 u |
7x1 =
7 u |
The number of coins that Cindy and Vanessa each had at first is the same. Make the number of coins that Cindy and Vanessa each had at first the same. LCM of 2 and 8 is 8.
Number of coins that Cindy and Vanessa used
= 4 u + 1 u
= 5 u
5 u = 30
1 u = 30 ÷ 5 = 6
Number of coins that Vanessa had in the end
= 7 u
= 7 x 6
= 42
Answer(s): 42
