PSLE At first, Gem had an equal number of red and green marbles . She gave away
34 of her red marbles and some green marbles. In the end, she was left with
35 of her marbles. What fraction of the green marbles did Gem give away?
|
Red |
Green |
Total |
Comparing red marbles and green marbles at first |
1x4x5 = 20 u |
1x4x5 = 20 u |
2x4x5 = 40 u |
Before |
4x5 = 20 u |
20 u |
5x8 = 40 u |
Change |
- 3x5 = - 15 u |
- 1 u |
- 3x8 = - 16 u |
After |
1x5 = 5 u |
19 u |
2x8 = 24 u |
After
1x5 =
5 u19 u
2x8 =
24 uThe number of red marbles at first is repeated. Make the number of red marbles the first the same. LCM of 4 and 1 is 4.
The total number of marbles at first is repeated. Make the total number of marbles at first the same. LCM of 8 and 5 is 40.
Number of green marbles that Gem was left with
= 24 u - 5 u
= 19 u
Number of green marbles that Gem gave away
= 20 u - 19 u
= 1 u
Fraction of the green marbles that Gem gave away =
120 Answer(s):
120