Kathy used
23 of her black stickers and
27 of her pink stickers to decorate her diary. In the end, she had an equal number of black stickers and pink stickers left. Given that Kathy had a total of 198 black and pink stickers at first, how many pink stickers did she use to decorate the diary?
|
Black stickers |
Pink stickers |
Before |
3x5 = 15 u |
7x1 = 7 u |
Change |
- 2x5 = - 10 u |
- 2x1 = - 2 u |
After |
1x5 = 5 u |
5x1 = 5 u |
The number of black stickers and pink stickers in the end is the same. Make the number of black stickers and pink stickers in the end the same. LCM of 1 and 5 is 5.
Total number of stickers that Kathy used to decorate the diary
= 15 u + 7 u
= 22 u
22 u = 198
1 u = 198 ÷ 22 = 9
Number of pink stickers that Kathy used to decorate the diary
= 2 u
= 2 x 9
= 18
Answer(s): 18