Adam has some green stickers and red stickers.
The number of green stickers is increased by 25% to 70.
The number of red stickers is increased by 50% to 99.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Red |
Before |
100% |
100% |
Change |
+ 25% |
+ 50% |
After |
125% = 70 |
150% = 99 |
(a)
100% + 25% = 125%
125% of green stickers = 70
100% of green stickers =
70125 x 100 = 56
100% + 50% = 150%
150% of red stickers = 99
100% of red stickers =
99150 x 100 = 66
Number of stickers at first
= 100% of green stickers + 100% of red stickers
= 56 + 66
= 122
(b)
Number of stickers in the end
= 70 + 99
= 169
Answer(s): (a) 122; (b) 169