Roshel had some eraser collection.
12 of them were grey and the rest were yellow. She gave away 188 of the yellow erasers and 10% of the grey erasers. She then had
16 of her eraser collection left. How many erasers did Roshel give away?
| |
Grey |
Yellow |
Total |
Total |
Before
|
1x3 =
3 u |
1x3 =
3 u |
2x3 =
6 u |
6x1 =
6 u |
Change
|
- 0.1x3 =
- 0.3 u |
- 188 |
|
- 5x1 =
- 5 u |
After
|
0.9x3 =
2.7 u |
3 u - 188 |
|
1x1 =
1 u |
The total number of erasers that Roshel had at first is repeated. Make the total number of erasers at first the same. LCM 2 and 6 is 6.
Number of grey erasers that Roshel gave away
= 10% x 1 u
=
10100 x 1 u
= 0.1 u
0.3 u - 188 = 5 u
5 u - 0.3 u = 188
4.7 u = 188
1 u = 188 ÷ 4.7 = 40
Number of erasers that Roshel gave away
= 5 u
= 5 x 40
= 200
Answer(s): 200
