PSLE Min had an equal number of red and grey beads. She gave 37 red beads and 16 grey beads to Mary. She gave the remaining beads to Nora. Nora was given 5 red beads for every 8 grey beads. How many beads did Min have at first?
|
Red |
Grey |
Before |
5 u + 37 |
8 u + 16 |
Change |
- 37 |
- 16 |
After |
5 u |
8 u |
The number of red and grey beads is equal at first.
5 u + 37 = 8 u + 16
8 u - 5 u = 37 - 16
3 u = 21
1 u = 21 ÷ 3 = 7
Number of red beads that Min had at first
= 5 u + 37
= 5 x 7 + 37
= 35 + 37
= 72
Number of beads that Min had at first
= 2 x 72
= 144
Answer(s): 144