PSLE At first, Betty had an equal number of pink and black marbles . She gave away
35 of her pink marbles and some black marbles. In the end, she was left with
23 of her marbles. What fraction of the black marbles was Betty left with?
|
Pink |
Black |
Total |
Comparing pink marbles and black marbles at first |
1x5x3 = 15 u |
1x5x3 = 15 u |
2x5x3 = 30 u |
Before |
5x3 = 15 u |
15 u |
3x10 = 30 u |
Change |
- 3x3 = - 9 u |
- 1 u |
- 2x10 = - 10 u |
After |
2x3 = 6 u |
14 u |
1x10 = 20 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 3 is 30.
Number of black marbles that Betty was left with
= 20 u - 6 u
= 14 u
Fraction of the black marbles that Betty was left with =
1415 Answer(s):
1415