PSLE Linda had an equal number of green and black beads. She gave 38 green beads and 18 black beads to Mary. She gave the remaining beads to Nora. Nora was given 3 green beads for every 5 black beads. How many beads did Linda have at first?
|
Green |
Black |
Before |
3 u + 38 |
5 u + 18 |
Change |
- 38 |
- 18 |
After |
3 u |
5 u |
The number of green and black beads is equal at first.
3 u + 38 = 5 u + 18
5 u - 3 u = 38 - 18
2 u = 20
1 u = 20 ÷ 2 = 10
Number of green beads that Linda had at first
= 3 u + 38
= 3 x 10 + 38
= 30 + 38
= 68
Number of beads that Linda had at first
= 2 x 68
= 136
Answer(s): 136