Adam has 72 red stickers.
He has 2 times as many red stickers than blue stickers.
After he gives away an equal number of red and blue stickers,
the number of red stickers is 3 times that of the blue stickers.
- How many red stickers are there in the end?
- How many blue stickers are there in the end?
- How many stickers are there in the end?
- How many stickers does Adam give away?
|
Red stickers |
Blue stickers |
Difference |
Before |
2 x 2 = 4 u |
1 x 2 = 2 u |
1 x 2 = 2 u |
Change |
- ? |
- ? |
|
After |
3 x 1 = 3 u |
1 x 1 = 1 u |
2 x 1 = 2 u |
(a)
The difference in the number between the red and blue stickers at first and in the end remains unchanged.
LCM of 1 and 2 is 2.
4 u = 72
1 u = 72 ÷ 4 = 18
Number of red stickers in the end
= 3 u
= 3 x 18
= 54
(b)
Number of blue stickers in the end
= 1 u
= 1 x 18
= 18
(c)
Total number of stickers in the end
= 54 + 18
= 72
(d)
Total number of stickers that Adam gives away
= (4 u - 3 u) x 2
= 1 u x 2
= 2 u
= 2 x 18
= 36
Answer(s): (a) 54; (b) 18; (c) 72; (d) 36