Erika had some sticker collection.
23 of them were yellow and the rest were black. She gave away 114 of the black stickers and 30% of the yellow stickers. She then had
16 of her sticker collection left. How many stickers did Erika give away?
| |
Yellow |
Black |
Total |
Total |
Before
|
2x2 =
4 u |
1x2 =
2 u |
3x2 =
6 u |
6x1 =
6 u |
Change
|
- 0.6x2 =
- 1.2 u |
- 114 |
|
- 5x1 =
- 5 u |
After
|
1.4x2 =
2.8 u |
2 u - 114 |
|
1x1 =
1 u |
The total number of stickers that Erika had at first is repeated. Make the total number of stickers at first the same. LCM 3 and 6 is 6.
Number of yellow stickers that Erika gave away
= 30% x 2 u
=
30100 x 2 u
= 0.6 u
1.2 u - 114 = 5 u
5 u - 1.2 u = 114
3.8 u = 114
1 u = 114 ÷ 3.8 = 30
Number of stickers that Erika gave away
= 5 u
= 5 x 30
= 150
Answer(s): 150
