Sabrina had some stamp collection.
35 of them were pink and the rest were blue. She gave away 102 of the blue stamps and 50% of the pink stamps. She then had
23 of her stamp collection left. How many stamps did Sabrina give away?
| |
Pink |
Blue |
Total |
Total |
Before
|
3x3 =
9 u |
2x3 =
6 u |
5x3 =
15 u |
3x5 =
15 u |
Change
|
- 1.5x3 =
- 4.5 u |
- 102 |
|
- 1x5 =
- 5 u |
After
|
1.5x3 =
4.5 u |
6 u - 102 |
|
2x5 =
10 u |
The total number of stamps that Sabrina had at first is repeated. Make the total number of stamps at first the same. LCM 5 and 3 is 15.
Number of pink stamps that Sabrina gave away
= 50% x 3 u
=
50100 x 3 u
= 1.5 u
4.5 u - 102 = 5 u
5 u - 4.5 u = 102
0.5 u = 102
1 u = 102 ÷ 0.5 = 204
Number of stamps that Sabrina gave away
= 5 u
= 5 x 204
= 1020
Answer(s): 1020
