Sarah used
23 of her green stickers and
25 of her white stickers to decorate her diary. In the end, she had an equal number of green stickers and white stickers left. Given that Sarah had a total of 84 green and white stickers at first, how many white stickers did she use to decorate the diary?
|
Green stickers |
White stickers |
Before |
3x3 = 9 u |
5x1 = 5 u |
Change |
- 2x3 = - 6 u |
- 2x1 = - 2 u |
After |
1x3 = 3 u |
3x1 = 3 u |
The number of green stickers and white stickers in the end is the same. Make the number of green stickers and white stickers in the end the same. LCM of 1 and 3 is 3.
Total number of stickers that Sarah used to decorate the diary
= 9 u + 5 u
= 14 u
14 u = 84
1 u = 84 ÷ 14 = 6
Number of white stickers that Sarah used to decorate the diary
= 2 u
= 2 x 6
= 12
Answer(s): 12