Question

有A、B、C三种商品,若购A种商品3件,B种商品7件,C种商品5件,共应付301元；若购A种商

Answer 1

4A+10B+7C=420 --- 3A+7B+5C=301 == A+3B+2C =121

3A+7B+5C=301 --- A+3B+2C =121 == 2A+4B+3C ==180

2A+4B+3C ==180 ---- A+3B+2C =121 == A+B+C == 59

所以一共59元