Emily had some sticker collection.
45 of them were grey and the rest were pink. She gave away 161 of the pink stickers and 30% of the grey stickers. She then had
23 of her sticker collection left. How many stickers did Emily give away?
| |
Grey |
Pink |
Total |
Total |
Before
|
4x3 =
12 u |
1x3 =
3 u |
5x3 =
15 u |
3x5 =
15 u |
Change
|
- 1.2x3 =
- 3.6 u |
- 161 |
|
- 1x5 =
- 5 u |
After
|
2.8x3 =
8.4 u |
3 u - 161 |
|
2x5 =
10 u |
The total number of stickers that Emily had at first is repeated. Make the total number of stickers at first the same. LCM 5 and 3 is 15.
Number of grey stickers that Emily gave away
= 30% x 4 u
=
30100 x 4 u
= 1.2 u
3.6 u - 161 = 5 u
5 u - 3.6 u = 161
1.4 u = 161
1 u = 161 ÷ 1.4 = 115
Number of stickers that Emily gave away
= 5 u
= 5 x 115
= 575
Answer(s): 575
