PSLE Nora had an equal number of black and yellow beads. She gave 32 black beads and 28 yellow beads to Mary. She gave the remaining beads to Nora. Nora was given 4 black beads for every 6 yellow beads. How many beads did Nora have at first?
|
Black |
Yellow |
Before |
4 u + 32 |
6 u + 28 |
Change |
- 32 |
- 28 |
After |
4 u |
6 u |
The number of black and yellow beads is equal at first.
4 u + 32 = 6 u + 28
6 u - 4 u = 32 - 28
2 u = 4
1 u = 4 ÷ 2 = 2
Number of black beads that Nora had at first
= 4 u + 32
= 4 x 2 + 32
= 8 + 32
= 40
Number of beads that Nora had at first
= 2 x 40
= 80
Answer(s): 80