Adam has 399 stickers.
After
13 of the red stickers and
25 of the green stickers are given away,
there is an equal number of red and green stickers left.
- How many red stickers are there in the end?
- How many more green stickers are there than red stickers at first?
- How many green stickers are given away?
|
Red |
Green |
Total |
Before |
3 x 3 = 9 u |
5 x 2 = 10 u |
399 |
Change |
- 1 x 3 = - 3 u |
- 2 x 2 = - 4 u |
|
After |
2 x 3 = 6 u |
3 x 2 = 6 u |
|
(a)
Fraction of the red stickers left
= 1 -
13 =
23 Fraction of the green stickers left
= 1 -
25 =
35 Number of red stickers and green stickers left is the same.
Make the number of red stickers and green stickers left the same using the LCM of 2 and 3.
LCM of 2 and 3 = 6
Total number of stickers
= 9 u + 10 u
= 19 u
19 u = 399
1 u = 399 ÷ 19 = 21
Number of red stickers in the end
= 6 u
= 6 x 21
= 126
(b)
Number of more green stickers than red stickers at first
= 10 u - 9 u
= 1 u
= 1 x 21
= 21
(c)
Number of green stickers given away
= 10 u - 6 u
= 4 u
= 4 x 21
= 84
Answer(s): (a) 126; (b) 21; (c) 84