PSLE Shiyun had an equal number of brown and blue beads. She gave 25 brown beads and 13 blue beads to Mary. She gave the remaining beads to Nora. Nora was given 3 brown beads for every 6 blue beads. How many beads did Shiyun have at first?
|
Brown |
Blue |
Before |
3 u + 25 |
6 u + 13 |
Change |
- 25 |
- 13 |
After |
3 u |
6 u |
The number of brown and blue beads is equal at first.
3 u + 25 = 6 u + 13
6 u - 3 u = 25 - 13
3 u = 12
1 u = 12 ÷ 3 = 4
Number of brown beads that Shiyun had at first
= 3 u + 25
= 3 x 4 + 25
= 12 + 25
= 37
Number of beads that Shiyun had at first
= 2 x 37
= 74
Answer(s): 74