Zara had some sticker collection.
12 of them were gold and the rest were silver. She gave away 198 of the silver stickers and 10% of the gold stickers. She then had
25 of her sticker collection left. How many stickers did Zara give away?
|
Gold |
Silver |
Total |
Total |
Before
|
1x5 = 5 u |
1x5 = 5 u |
2x5 = 10 u |
5x2 = 10 u |
Change
|
- 0.1x5 = - 0.5 u |
- 198 |
|
- 3x2 = - 6 u |
After
|
0.9x5 = 4.5 u |
5 u - 198 |
|
2x2 = 4 u |
The total number of stickers that Zara had at first is repeated. Make the total number of stickers at first the same. LCM 2 and 5 is 10.
Number of gold stickers that Zara gave away
= 10% x 1 u
=
10100 x 1 u
= 0.1 u
0.5 u - 198 = 6 u
6 u - 0.5 u = 198
5.5 u = 198
1 u = 198 ÷ 5.5 = 36
Number of stickers that Zara gave away
= 6 u
= 6 x 36
= 216
Answer(s): 216