On the table there are some biscuit,sweets and chocolate.Biscuit and sweets are 50 kilos.Sweets and chocolate are 70 kilos.Chocolate and biscuits are 60 kilos.Please work out:( )1.How many kilos of biscuits are there?A.40 B.30 C.20( )2.How many kilos

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On the table there are some biscuit,sweets and chocolate.Biscuit and sweets are 50 kilos.Sweets and chocolate are 70 kilos.Chocolate and biscuits are 60 kilos.Please work out:
( )1.How many kilos of biscuits are there?
A.40 B.30 C.20
( )2.How many kilos of sweets are there?
A.30 B.40 C.50
( )3.How many kilos of chocolate are there?
A.20 B.30 C.40

1.C
2.A
3.C

A C A

1,C 2,A 3,C

C
A
C

三元一次方程组啊,列式求解就可以了