Lee had a total of 121 black and pink beads. After giving away
78 of the black beads and 76 pink beads, there was an equal number of black and pink beads left. How many black beads did he have at first?
|
Black beads |
Pink beads |
Total |
Before |
8 u |
1 u + 76 |
121 |
Change |
- 7 u |
- 76 |
|
After |
1 u |
1 u |
|
Total number of beads at first
= 8 u + 1 u + 76
= 9 u + 76
9 u + 76 = 121
9 u = 121 - 76
9 u = 45
1 u = 45 ÷ 9 = 5
Number of black beads that Lee had at first
= 8 u
= 8 x 5
= 40
Answer(s): 40