Zoe, Lucy and Betty had a total of 241 erasers. Zoe gave
18 of her erasers away. Betty gave away 5 times as many erasers as Zoe and Lucy gave away 57 erasers. In the end, they had 166 erasers left. How many erasers did Lucy and Betty have in total in the end?
| |
Zoe |
Lucy |
Betty |
Total |
| Before |
8 u |
? |
? |
241 |
| Change |
- 1 u |
- 57 |
- 5 u |
- 75 |
| After |
7 u |
? |
166 |
Number of erasers that Betty gave away
= 5 x 1 u
= 5 u
Number of erasers given away
= 1 u + 57 + 5 u
= 6 u + 57
6 u + 57 = 241 - 166
6 u = 75 - 57
6 u = 18
1 u = 18 ÷ 6 = 3
Number of erasers that Lucy and Betty had in the end
= 166 - 7 u
= 166 - 7 x 3
= 166 - 21
= 145
Answer(s): 145
