Sabrina had some sticker collection.
19 of them were gold and the rest were black. She gave away 189 of the black stickers and 30% of the gold stickers. She then had
23 of her sticker collection left. How many stickers did Sabrina give away?
| |
Gold |
Black |
Total |
Total |
Before
|
1x1 =
1 u |
8x1 =
8 u |
9x1 =
9 u |
3x3 =
9 u |
Change
|
- 0.3x1 =
- 0.3 u |
- 189 |
|
- 1x3 =
- 3 u |
After
|
0.7x1 =
0.7 u |
8 u - 189 |
|
2x3 =
6 u |
The total number of stickers that Sabrina had at first is repeated. Make the total number of stickers at first the same. LCM 9 and 3 is 9.
Number of gold stickers that Sabrina gave away
= 30% x 1 u
=
30100 x 1 u
= 0.3 u
0.3 u - 189 = 3 u
3 u - 0.3 u = 189
2.7 u = 189
1 u = 189 ÷ 2.7 = 70
Number of stickers that Sabrina gave away
= 3 u
= 3 x 70
= 210
Answer(s): 210
