Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 40% to 70.
The number of red stickers is decreased by 50% to 50.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 40% |
- 50% |
After |
140% = 70 |
50% = 50 |
(a)
100% - 40% = 140%
140% of red stickers = 70
100% of red stickers =
70140 x 100 = 50
100% - 50% = 50%
50% of green stickers = 50
100% of green stickers =
5050 x 100 = 100
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 50 + 100
= 150
(b)
Number of stickers in the end
= 70 + 50
= 120
Answer(s): (a) 150; (b) 120