Anna and Penelope had an equal number of stickers at first. Anna used
12 of her stickers and Penelope used
17 of her stickers. They used 63 stickers altogether. How many stickers did Penelope have in the end?
|
Anna |
Penelope |
Before |
2x7 = 14 u |
7x2 = 14 u |
Change |
- 1x7 = - 7 u |
- 1x2 = - 2 u |
After |
1x7 = 7 u |
6x2 = 12 u |
The number of stickers that Anna and Penelope each had at first is the same. Make the number of stickers that Anna and Penelope each had at first the same. LCM of 2 and 7 is 14.
Number of stickers that Anna and Penelope used
= 7 u + 2 u
= 9 u
9 u = 63
1 u = 63 ÷ 9 = 7
Number of stickers that Penelope had in the end
= 12 u
= 12 x 7
= 84
Answer(s): 84