Betty, Olivia and Gabby had a total of 331 erasers. Betty gave
25 of her erasers away. Gabby gave away 2 times as many erasers as Betty and Olivia gave away 87 erasers. In the end, they had 136 erasers left. How many erasers did Olivia and Gabby have in total in the end?
|
Betty |
Olivia |
Gabby |
Total |
Before |
5 u |
? |
? |
331 |
Change |
- 2 u |
- 87 |
- 4 u |
- 195 |
After |
3 u |
? |
136 |
Number of erasers that Gabby gave away
= 2 x 2 u
= 4 u
Number of erasers given away
= 2 u + 87 + 4 u
= 6 u + 87
6 u + 87 = 331 - 136
6 u = 195 - 87
6 u = 108
1 u = 108 ÷ 6 = 18
Number of erasers that Olivia and Gabby had in the end
= 136 - 3 u
= 136 - 3 x 18
= 136 - 54
= 82
Answer(s): 82