Adam has some red stickers and green stickers.
The number of red stickers is increased by 20% to 66.
The number of green stickers is increased by 50% to 57.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 20% |
+ 50% |
After |
120% = 66 |
150% = 57 |
(a)
100% + 20% = 120%
120% of red stickers = 66
100% of red stickers =
66120 x 100 = 55
100% + 50% = 150%
150% of green stickers = 57
100% of green stickers =
57150 x 100 = 38
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 55 + 38
= 93
(b)
Number of stickers in the end
= 66 + 57
= 123
Answer(s): (a) 93; (b) 123