PSLE Sabrina had an equal number of pink and white beads. She gave 39 pink beads and 21 white beads to Mary. She gave the remaining beads to Nora. Nora was given 3 pink beads for every 6 white beads. How many beads did Sabrina have at first?
|
Pink |
White |
Before |
3 u + 39 |
6 u + 21 |
Change |
- 39 |
- 21 |
After |
3 u |
6 u |
The number of pink and white beads is equal at first.
3 u + 39 = 6 u + 21
6 u - 3 u = 39 - 21
3 u = 18
1 u = 18 ÷ 3 = 6
Number of pink beads that Sabrina had at first
= 3 u + 39
= 3 x 6 + 39
= 18 + 39
= 57
Number of beads that Sabrina had at first
= 2 x 57
= 114
Answer(s): 114