Winnie had some button collection.
12 of them were grey and the rest were pink. She gave away 143 of the pink buttons and 20% of the grey buttons. She then had
14 of her button collection left. How many buttons did Winnie give away?
| |
Grey |
Pink |
Total |
Total |
Before
|
1x2 =
2 u |
1x2 =
2 u |
2x2 =
4 u |
4x1 =
4 u |
Change
|
- 0.2x2 =
- 0.4 u |
- 143 |
|
- 3x1 =
- 3 u |
After
|
0.8x2 =
1.6 u |
2 u - 143 |
|
1x1 =
1 u |
The total number of buttons that Winnie had at first is repeated. Make the total number of buttons at first the same. LCM 2 and 4 is 4.
Number of grey buttons that Winnie gave away
= 20% x 1 u
=
20100 x 1 u
= 0.2 u
0.4 u - 143 = 3 u
3 u - 0.4 u = 143
2.6 u = 143
1 u = 143 ÷ 2.6 = 55
Number of buttons that Winnie gave away
= 3 u
= 3 x 55
= 165
Answer(s): 165
