Three factories, A, B and C, produce rice. The rice produced by A factory accounts for 30% of the total, the rice produced by B factory accounts for 2/5 of the total, and the rice produced by C factory is 42 tons. How many tons of rice have the three factories A, B and C produced?

Solution: 1-30%-2/5=0.3

42÷3= 14 (ton)

14× 10= 140 (ton)

A: Three factories, A, B and C, produce rice 140 tons.

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