PSLE At first, Lynn had an equal number of purple and black beads . She gave away
35 of her purple beads and some black beads. In the end, she was left with
23 of her beads. What fraction of the black beads did Lynn give away?
|
Purple |
Black |
Total |
Comparing purple beads and black beads 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 |
After
2x3 =
6 u14 u
1x10 =
20 uThe number of purple beads at first is repeated. Make the number of purple beads the first the same. LCM of 5 and 1 is 5.
The total number of beads at first is repeated. Make the total number of beads at first the same. LCM of 10 and 3 is 30.
Number of black beads that Lynn was left with
= 20 u - 6 u
= 14 u
Number of black beads that Lynn gave away
= 15 u - 14 u
= 1 u
Fraction of the black beads that Lynn gave away =
115 Answer(s):
115