Sabrina has a bag containing some yellow and blue stickers. If she removes 13 yellow stickers, 25% of the stickers in the bag are blue. If she adds another 8 blue stickers, 50% of the stickers in the bag are blue. How many yellow stickers are in the bag?
| |
Yellow stickers |
Blue stickers |
| Before |
3 u + 13 |
1 u |
| Change 1 |
- 13 |
|
| After 1 |
3x1 =
3 u |
1x1 =
1 u |
| Change 2 |
|
+ 8 |
| After 2 |
1x3 =
3 u |
1x3 =
3 u |
25% =
25100 =
1450% =
50100 =
12The number of yellow stickers remains unchanged at the second change when she adds another 8 blue stickers. Make the number of yellow stickers the same at the second change. LCM of 3 and 1 is 3.
Number of blue stickers added
= 3 u - 1 u
= 2 u
2 u = 8
1 u = 8 ÷ 2 = 4
Number of yellow stickers at first
= 3 u + 13
= 3 x 4 + 13
= 12 + 13
= 25
Answer(s): 25
