Gabby had the same number of black, pink and red erasers at first. After giving some black and pink erasers and 65 red erasers away, Gabby had 161 erasers left. There were 5 times as many black erasers as pink erasers left. The number of red erasers left was 26 fewer than the number of black erasers left. How many red erasers did she have at first?
| |
Pink |
Black |
Red |
Total |
| Before |
5 u + 39 |
5 u + 39 |
5 u + 39 |
|
| Change |
- 4 u - 39 |
- 39 |
- 65 |
|
| After |
1 u |
5 u |
5 u - 26 |
161 |
Gabby had the same number of black, pink and red erasers at first.
Total number of erasers in the end
= 1 u + 5 u + 5 u - 26
= 11 u - 26
11 u - 26 = 161
11 u = 161 + 26
11 u = 187
1 u = 187 ÷ 11 = 17
Number of red erasers that Gabby had at first
= 5 u - 26 + 65
= 5 u + 39
= 5 x 17 + 39
= 124
Answer(s): 124
