PSLE At first, Risa had an equal number of pink and silver beads . She gave away
45 of her pink beads and some silver beads. In the end, she was left with
14 of her beads. What fraction of the silver beads did Risa give away?
|
Pink |
Silver |
Total |
Comparing pink beads and silver beads at first |
1x5x2 = 10 u |
1x5x2 = 10 u |
2x5x2 = 20 u |
Before |
5x2 = 10 u |
10 u |
4x5 = 20 u |
Change |
- 4x2 = - 8 u |
- 7 u |
- 1x5 = - 15 u |
After |
1x2 = 2 u |
3 u |
3x5 = 5 u |
After
1x2 =
2 u3 u
3x5 =
5 uThe number of pink beads at first is repeated. Make the number of pink 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 4 is 20.
Number of silver beads that Risa was left with
= 5 u - 2 u
= 3 u
Number of silver beads that Risa gave away
= 10 u - 3 u
= 7 u
Fraction of the silver beads that Risa gave away =
710 Answer(s):
710