PSLE At first, Xandra had an equal number of black and red marbles . She gave away
34 of her black marbles and some red marbles. In the end, she was left with
25 of her marbles. What fraction of the red marbles was Xandra left with?
|
Black |
Red |
Total |
Comparing black marbles and red 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 |
- 9 u |
- 2x8 = - 24 u |
After |
1x5 = 5 u |
11 u |
3x8 = 16 u |
The number of black marbles at first is repeated. Make the number of black 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 red marbles that Xandra was left with
= 16 u - 5 u
= 11 u
Fraction of the red marbles that Xandra was left with =
1120 Answer(s):
1120