Adam has some green stickers and red stickers.
The number of green stickers is increased by 40% to 63.
The number of red stickers is increased by 20% to 66.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Green |
Red |
Before |
100% |
100% |
Change |
+ 40% |
+ 20% |
After |
140% = 63 |
120% = 66 |
(a)
100% + 40% = 140%
140% of green stickers = 63
100% of green stickers =
63140 x 100 = 45
100% + 20% = 120%
120% of red stickers = 66
100% of red stickers =
66120 x 100 = 55
Number of stickers at first
= 100% of green stickers + 100% of red stickers
= 45 + 55
= 100
(b)
Number of stickers in the end
= 63 + 66
= 129
Answer(s): (a) 100; (b) 129