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