PSLE Anna had an equal number of grey and blue beads. She gave 28 grey beads and 10 blue beads to Mary. She gave the remaining beads to Nora. Nora was given 2 grey beads for every 5 blue beads. How many beads did Anna have at first?
|
Grey |
Blue |
Before |
2 u + 28 |
5 u + 10 |
Change |
- 28 |
- 10 |
After |
2 u |
5 u |
The number of grey and blue beads is equal at first.
2 u + 28 = 5 u + 10
5 u - 2 u = 28 - 10
3 u = 18
1 u = 18 ÷ 3 = 6
Number of grey beads that Anna had at first
= 2 u + 28
= 2 x 6 + 28
= 12 + 28
= 40
Number of beads that Anna had at first
= 2 x 40
= 80
Answer(s): 80