Min and Winnie had an equal number of coins at first. Min used
13 of her coins and Winnie used
19 of her coins. They used 12 coins altogether. How many coins did Winnie have in the end?
| |
Min |
Winnie |
| Before |
3x3 =
9 u |
9x1 =
9 u |
| Change |
- 1x3 =
- 3 u |
- 1x1 =
- 1 u |
| After |
2x3 =
6 u |
8x1 =
8 u |
The number of coins that Min and Winnie each had at first is the same. Make the number of coins that Min and Winnie each had at first the same. LCM of 3 and 9 is 9.
Number of coins that Min and Winnie used
= 3 u + 1 u
= 4 u
4 u = 12
1 u = 12 ÷ 4 = 3
Number of coins that Winnie had in the end
= 8 u
= 8 x 3
= 24
Answer(s): 24
