PSLE Min had an equal number of red and silver beads. She gave 39 red beads and 21 silver beads to Mary. She gave the remaining beads to Nora. Nora was given 4 red beads for every 6 silver beads. How many beads did Min have at first?
|
Red |
Silver |
Before |
4 u + 39 |
6 u + 21 |
Change |
- 39 |
- 21 |
After |
4 u |
6 u |
The number of red and silver beads is equal at first.
4 u + 39 = 6 u + 21
6 u - 4 u = 39 - 21
2 u = 18
1 u = 18 ÷ 2 = 9
Number of red beads that Min had at first
= 4 u + 39
= 4 x 9 + 39
= 36 + 39
= 75
Number of beads that Min had at first
= 2 x 75
= 150
Answer(s): 150