Zara used
25 of her grey stickers and
27 of her white stickers to decorate her diary. In the end, she had an equal number of grey stickers and white stickers left. Given that Zara had a total of 368 grey and white stickers at first, how many white stickers did she use to decorate the diary?
|
Grey stickers |
White stickers |
Before |
5x5 = 25 u |
7x3 = 21 u |
Change |
- 2x5 = - 10 u |
- 2x3 = - 6 u |
After |
3x5 = 15 u |
5x3 = 15 u |
The number of grey stickers and white stickers in the end is the same. Make the number of grey stickers and white stickers in the end the same. LCM of 3 and 5 is 15.
Total number of stickers that Zara used to decorate the diary
= 25 u + 21 u
= 46 u
46 u = 368
1 u = 368 ÷ 46 = 8
Number of white stickers that Zara used to decorate the diary
= 6 u
= 6 x 8
= 48
Answer(s): 48