Lynn, Penelope and Olivia had a total of 549 erasers. Lynn gave
57 of her erasers away. Olivia gave away 2 times as many erasers as Lynn and Penelope gave away 100 erasers. In the end, they had 179 erasers left. How many erasers did Penelope and Olivia have in total in the end?
| |
Lynn |
Penelope |
Olivia |
Total |
| Before |
7 u |
? |
? |
549 |
| Change |
- 5 u |
- 100 |
- 10 u |
- 370 |
| After |
2 u |
? |
179 |
Number of erasers that Olivia gave away
= 2 x 5 u
= 10 u
Number of erasers given away
= 5 u + 100 + 10 u
= 15 u + 100
15 u + 100 = 549 - 179
15 u = 370 - 100
15 u = 270
1 u = 270 ÷ 15 = 18
Number of erasers that Penelope and Olivia had in the end
= 179 - 2 u
= 179 - 2 x 18
= 179 - 36
= 143
Answer(s): 143
