PSLE At first, Yen had an equal number of purple and black marbles . She gave away
25 of her purple marbles and some black marbles. In the end, she was left with
23 of her marbles. What fraction of the black marbles was Yen left with?
|
Purple |
Black |
Total |
Comparing purple marbles and black marbles at first |
1x5x3 = 15 u |
1x5x3 = 15 u |
2x5x3 = 30 u |
Before |
5x3 = 15 u |
15 u |
3x10 = 30 u |
Change |
- 2x3 = - 6 u |
- 4 u |
- 2x10 = - 10 u |
After |
3x3 = 9 u |
11 u |
1x10 = 20 u |
The number of purple marbles at first is repeated. Make the number of purple marbles the first the same. LCM of 5 and 1 is 5.
The total number of marbles at first is repeated. Make the total number of marbles at first the same. LCM of 10 and 3 is 30.
Number of black marbles that Yen was left with
= 20 u - 9 u
= 11 u
Fraction of the black marbles that Yen was left with =
1115 Answer(s):
1115