Kimberly, Winnie and Irene had a total of 231 stamps. Kimberly gave
110 of her stamps away. Irene gave away 5 times as many stamps as Kimberly and Winnie gave away 20 stamps. In the end, they had 133 stamps left. How many stamps did Winnie and Irene have in total in the end?
| |
Kimberly |
Winnie |
Irene |
Total |
| Before |
10 u |
? |
? |
231 |
| Change |
- 1 u |
- 20 |
- 5 u |
- 98 |
| After |
9 u |
? |
133 |
Number of stamps that Irene gave away
= 5 x 1 u
= 5 u
Number of stamps given away
= 1 u + 20 + 5 u
= 6 u + 20
6 u + 20 = 231 - 133
6 u = 98 - 20
6 u = 78
1 u = 78 ÷ 6 = 13
Number of stamps that Winnie and Irene had in the end
= 133 - 9 u
= 133 - 9 x 13
= 133 - 117
= 16
Answer(s): 16
