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There are 20 bags of wheat in the third grade math. The four bags weigh 42, 47, 46 and 43 respectively. How heavy are these 20 bags?
Mathematics in Grade Three: There are 20 bags of wheat, of which 4 bags weigh 42kg, 47kg, 46kg and 43kg respectively. How heavy are these 20 bags?

Solution: Two methods:

1) and then multiply by the total:

(42+47+46+43)/4 x 20

= 178/4x20

=890 Jin.

Method 2:

(42+47+46+43) x 20/4

= 178 x 5

=890 Jin.

A: 20 bags of wheat weigh 890 kilograms.