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

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
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

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
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