Barbara used
34 of her white stickers and
35 of her blue stickers to decorate her diary. In the end, she had an equal number of white stickers and blue stickers left. Given that Barbara had a total of 78 white and blue stickers at first, how many blue stickers did she use to decorate the diary?
|
White stickers |
Blue stickers |
Before |
4x2 = 8 u |
5x1 = 5 u |
Change |
- 3x2 = - 6 u |
- 3x1 = - 3 u |
After |
1x2 = 2 u |
2x1 = 2 u |
The number of white stickers and blue stickers in the end is the same. Make the number of white stickers and blue stickers in the end the same. LCM of 1 and 2 is 2.
Total number of stickers that Barbara used to decorate the diary
= 8 u + 5 u
= 13 u
13 u = 78
1 u = 78 ÷ 13 = 6
Number of blue stickers that Barbara used to decorate the diary
= 3 u
= 3 x 6
= 18
Answer(s): 18