PSLE At first, Jean had an equal number of black and gold marbles . She gave away
25 of her black marbles and some gold marbles. In the end, she was left with
23 of her marbles. What fraction of the gold marbles did Jean give away?
|
Black |
Gold |
Total |
Comparing black marbles and gold 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 |
After
3x3 =
9 u11 u
1x10 =
20 uThe number of black marbles at first is repeated. Make the number of black 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 gold marbles that Jean was left with
= 20 u - 9 u
= 11 u
Number of gold marbles that Jean gave away
= 15 u - 11 u
= 4 u
Fraction of the gold marbles that Jean gave away =
415 Answer(s):
415