PSLE Ivory had an equal number of silver and red beads. She gave 13 silver beads and 10 red beads to Mary. She gave the remaining beads to Nora. Nora was given 4 silver beads for every 7 red beads. How many beads did Ivory have at first?
|
Silver |
Red |
Before |
4 u + 13 |
7 u + 10 |
Change |
- 13 |
- 10 |
After |
4 u |
7 u |
The number of silver and red beads is equal at first.
4 u + 13 = 7 u + 10
7 u - 4 u = 13 - 10
3 u = 3
1 u = 3 ÷ 3 = 1
Number of silver beads that Ivory had at first
= 4 u + 13
= 4 x 1 + 13
= 4 + 13
= 17
Number of beads that Ivory had at first
= 2 x 17
= 34
Answer(s): 34