Gabby and Sarah had an equal number of coins at first. Gabby used
12 of her coins and Sarah used
16 of her coins. They used 16 coins altogether. How many coins did Sarah have in the end?
| |
Gabby |
Sarah |
| Before |
2x3 =
6 u |
6x1 =
6 u |
| Change |
- 1x3 =
- 3 u |
- 1x1 =
- 1 u |
| After |
1x3 =
3 u |
5x1 =
5 u |
The number of coins that Gabby and Sarah each had at first is the same. Make the number of coins that Gabby and Sarah each had at first the same. LCM of 2 and 6 is 6.
Number of coins that Gabby and Sarah used
= 3 u + 1 u
= 4 u
4 u = 16
1 u = 16 ÷ 4 = 4
Number of coins that Sarah had in the end
= 5 u
= 5 x 4
= 20
Answer(s): 20
