PSLE Jaslyn had an equal number of black and white beads. She gave 29 black beads and 21 white beads to Mary. She gave the remaining beads to Nora. Nora was given 5 black beads for every 7 white beads. How many beads did Jaslyn have at first?
|
Black |
White |
Before |
5 u + 29 |
7 u + 21 |
Change |
- 29 |
- 21 |
After |
5 u |
7 u |
The number of black and white beads is equal at first.
5 u + 29 = 7 u + 21
7 u - 5 u = 29 - 21
2 u = 8
1 u = 8 ÷ 2 = 4
Number of black beads that Jaslyn had at first
= 5 u + 29
= 5 x 4 + 29
= 20 + 29
= 49
Number of beads that Jaslyn had at first
= 2 x 49
= 98
Answer(s): 98