PSLE At first, Fiona had an equal number of blue and black marbles . She gave away
25 of her blue marbles and some black marbles. In the end, she was left with
23 of her marbles. What fraction of the black marbles was Fiona left with?
|
Blue |
Black |
Total |
Comparing blue 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 blue marbles at first is repeated. Make the number of blue 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 Fiona was left with
= 20 u - 9 u
= 11 u
Fraction of the black marbles that Fiona was left with =
1115 Answer(s):
1115