Adam has some blue stickers and red stickers.
The number of blue stickers is decreased by 10% to 63.
The number of red stickers is decreased by 50% to 98.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
- 10% |
- 50% |
After |
90% = 63 |
50% = 98 |
(a)
100% - 10% = 90%
90% of red stickers = 63
100% of red stickers =
6390 x 100 = 70
100% - 50% = 50%
50% of green stickers = 98
100% of green stickers =
9850 x 100 = 196
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 70 + 196
= 266
(b)
Number of stickers in the end
= 63 + 98
= 161
Answer(s): (a) 266; (b) 161