PSLE At first, Fiona had an equal number of purple and yellow marbles . She gave away
25 of her purple marbles and some yellow marbles. In the end, she was left with
35 of her marbles. What fraction of the yellow marbles did Fiona give away?
|
Purple |
Yellow |
Total |
Comparing purple marbles and yellow marbles at first |
1x5x1 = 5 u |
1x5x1 = 5 u |
2x5x1 = 10 u |
Before |
5x1 = 5 u |
5 u |
5x2 = 10 u |
Change |
- 2x1 = - 2 u |
- 2 u |
- 3x2 = - 4 u |
After |
3x1 = 3 u |
3 u |
2x2 = 6 u |
After
3x1 =
3 u3 u
2x2 =
6 uThe 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 5 is 10.
Number of yellow marbles that Fiona was left with
= 6 u - 3 u
= 3 u
Number of yellow marbles that Fiona gave away
= 5 u - 3 u
= 2 u
Fraction of the yellow marbles that Fiona gave away =
25 Answer(s):
25