Joelle used
25 of her red stickers and
37 of her pink stickers to decorate her diary. In the end, she had an equal number of red stickers and pink stickers left. Given that Joelle had a total of 451 red and pink stickers at first, how many pink stickers did she use to decorate the diary?
|
Red stickers |
Pink stickers |
Before |
5x4 = 20 u |
7x3 = 21 u |
Change |
- 2x4 = - 8 u |
- 3x3 = - 9 u |
After |
3x4 = 12 u |
4x3 = 12 u |
The number of red stickers and pink stickers in the end is the same. Make the number of red stickers and pink stickers in the end the same. LCM of 3 and 4 is 12.
Total number of stickers that Joelle used to decorate the diary
= 20 u + 21 u
= 41 u
41 u = 451
1 u = 451 ÷ 41 = 11
Number of pink stickers that Joelle used to decorate the diary
= 9 u
= 9 x 11
= 99
Answer(s): 99