PSLE At first, Dana had an equal number of silver and black beads . She gave away
35 of her silver beads and some black beads. In the end, she was left with
25 of her beads. What fraction of the black beads did Dana give away?
|
Silver |
Black |
Total |
Comparing silver beads and black beads at first |
1x5x1 = 5 u |
1x5x1 = 5 u |
2x5x1 = 10 u |
Before |
5x1 = 5 u |
5 u |
5x2 = 10 u |
Change |
- 3x1 = - 3 u |
- 3 u |
- 2x2 = - 6 u |
After |
2x1 = 2 u |
2 u |
3x2 = 4 u |
After
2x1 =
2 u2 u
3x2 =
4 uThe number of silver beads at first is repeated. Make the number of silver 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 5 is 10.
Number of black beads that Dana was left with
= 4 u - 2 u
= 2 u
Number of black beads that Dana gave away
= 5 u - 2 u
= 3 u
Fraction of the black beads that Dana gave away =
35 Answer(s):
35