PSLE At first, Jen had an equal number of black and yellow marbles . She gave away
23 of her black marbles and some yellow marbles. In the end, she was left with
25 of her marbles. What fraction of the yellow marbles was Jen left with?
|
Black |
Yellow |
Total |
Comparing black marbles and yellow marbles at first |
1x3x5 = 15 u |
1x3x5 = 15 u |
2x3x5 = 30 u |
Before |
3x5 = 15 u |
15 u |
5x6 = 30 u |
Change |
- 2x5 = - 10 u |
- 8 u |
- 2x6 = - 18 u |
After |
1x5 = 5 u |
7 u |
3x6 = 12 u |
The number of black marbles at first is repeated. Make the number of black marbles the first the same. LCM of 3 and 1 is 3.
The total number of marbles at first is repeated. Make the total number of marbles at first the same. LCM of 6 and 5 is 30.
Number of yellow marbles that Jen was left with
= 12 u - 5 u
= 7 u
Fraction of the yellow marbles that Jen was left with =
715 Answer(s):
715