PSLE Winnie had an equal number of white and yellow beads. She gave 25 white beads and 15 yellow beads to Mary. She gave the remaining beads to Nora. Nora was given 4 white beads for every 6 yellow beads. How many beads did Winnie have at first?
|
White |
Yellow |
Before |
4 u + 25 |
6 u + 15 |
Change |
- 25 |
- 15 |
After |
4 u |
6 u |
The number of white and yellow beads is equal at first.
4 u + 25 = 6 u + 15
6 u - 4 u = 25 - 15
2 u = 10
1 u = 10 ÷ 2 = 5
Number of white beads that Winnie had at first
= 4 u + 25
= 4 x 5 + 25
= 20 + 25
= 45
Number of beads that Winnie had at first
= 2 x 45
= 90
Answer(s): 90