PSLE At first, Cathy had an equal number of pink and red marbles . She gave away
25 of her pink marbles and some red marbles. In the end, she was left with
34 of her marbles. What fraction of the red marbles was Cathy left with?
|
Pink |
Red |
Total |
Comparing pink marbles and red marbles at first |
1x5x2 = 10 u |
1x5x2 = 10 u |
2x5x2 = 20 u |
Before |
5x2 = 10 u |
10 u |
4x5 = 20 u |
Change |
- 2x2 = - 4 u |
- 1 u |
- 3x5 = - 5 u |
After |
3x2 = 6 u |
9 u |
1x5 = 15 u |
The 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 4 is 20.
Number of red marbles that Cathy was left with
= 15 u - 6 u
= 9 u
Fraction of the red marbles that Cathy was left with =
910 Answer(s):
910