Three questions in one lesson of fifth grade mathematics - Training Enrollment Network

Three questions in one lesson of fifth grade mathematics

Assumption: x kg of flour and 4x kg of rice.

4x-x=30

3x=30

x= 10

10*4=40

Answer: Flour 10 kg, rice 40 kg.

The second question seems to be missing a condition.

I am a math teacher in grade six.

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