If your team consisted of only you, your sister, and your mother, then your mother would have lost 17 pounds, and your sister would have lost 18 pounds.
-2, -5, -8
You're subtracting three each time.
It would be:
Tens | Ones
3 + 4
2 + 14
1 + 24
0 + 34
Hope this helped! c:
Ten and seventy-three hundredths