Olivia, Lucy and Risa had a total of 445 coins. Olivia gave
57 of her coins away. Risa gave away 2 times as many coins as Olivia and Lucy gave away 96 coins. In the end, they had 169 coins left. How many coins did Lucy and Risa have in total in the end?
| |
Olivia |
Lucy |
Risa |
Total |
| Before |
7 u |
? |
? |
445 |
| Change |
- 5 u |
- 96 |
- 10 u |
- 276 |
| After |
2 u |
? |
169 |
Number of coins that Risa gave away
= 2 x 5 u
= 10 u
Number of coins given away
= 5 u + 96 + 10 u
= 15 u + 96
15 u + 96 = 445 - 169
15 u = 276 - 96
15 u = 180
1 u = 180 ÷ 15 = 12
Number of coins that Lucy and Risa had in the end
= 169 - 2 u
= 169 - 2 x 12
= 169 - 24
= 145
Answer(s): 145
