+
10
+
10
=
30
................ has money.
30
-
25
=
five
The rest of .......................'s money
five
-
2
=
3 ............................. A, B and C scores.
A
+
B
+
C
=
30
-
three
=
27...............ABC paid all the expenses, including the thermos bottle in 25 yuan, and 2 yuan was put into his pocket by the workers ... This is reasonable. The per capita payment figure is still the same as that of 9 yuan-the thermos bottle used to be in 25 yuan, the workers pocketed 2 yuan, and the total expenditure was in 27 yuan, which had nothing to do with 30 yuan.