Zara used
34 of her black stickers and
25 of her green stickers to decorate her diary. In the end, she had an equal number of black stickers and green stickers left. Given that Zara had a total of 51 black and green stickers at first, how many green stickers did she use to decorate the diary?
| |
Black stickers |
Green stickers |
| Before |
4x3 =
12 u |
5x1 =
5 u |
| Change |
- 3x3 =
- 9 u |
- 2x1 =
- 2 u |
| After |
1x3 =
3 u |
3x1 =
3 u |
The number of black stickers and green stickers in the end is the same. Make the number of black stickers and green stickers in the end the same. LCM of 1 and 3 is 3.
Total number of stickers that Zara used to decorate the diary
= 12 u + 5 u
= 17 u
17 u = 51
1 u = 51 ÷ 17 = 3
Number of green stickers that Zara used to decorate the diary
= 2 u
= 2 x 3
= 6
Answer(s): 6
