Kathy, Lynn and Tammy had a total of 252 coins. Kathy gave
18 of her coins away. Tammy gave away 4 times as many coins as Kathy and Lynn gave away 21 coins. In the end, they had 141 coins left. How many coins did Lynn and Tammy have in total in the end?
| |
Kathy |
Lynn |
Tammy |
Total |
| Before |
8 u |
? |
? |
252 |
| Change |
- 1 u |
- 21 |
- 4 u |
- 111 |
| After |
7 u |
? |
141 |
Number of coins that Tammy gave away
= 4 x 1 u
= 4 u
Number of coins given away
= 1 u + 21 + 4 u
= 5 u + 21
5 u + 21 = 252 - 141
5 u = 111 - 21
5 u = 90
1 u = 90 ÷ 5 = 18
Number of coins that Lynn and Tammy had in the end
= 141 - 7 u
= 141 - 7 x 18
= 141 - 126
= 15
Answer(s): 15
