Adam has some red stickers and green stickers.
The number of red stickers is increased by 20% to 54.
The number of green stickers is increased by 40% to 63.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Red |
Green |
Before |
100% |
100% |
Change |
+ 20% |
+ 40% |
After |
120% = 54 |
140% = 63 |
(a)
100% + 20% = 120%
120% of red stickers = 54
100% of red stickers =
54120 x 100 = 45
100% + 40% = 140%
140% of green stickers = 63
100% of green stickers =
63140 x 100 = 45
Number of stickers at first
= 100% of red stickers + 100% of green stickers
= 45 + 45
= 90
(b)
Number of stickers in the end
= 54 + 63
= 117
Answer(s): (a) 90; (b) 117