Intellectual math problem [How did you learn to test the intellectual problem in the third grade]

First, I didn't see the topic clearly.

Second, father = mother =4*9=36, and now the age of the whole family is 9+36+36 = 8 1,1-81= 30,30/3 =10 years.

So after ten years, the total age of a family of three is 1 1 1 year.

Third, mass is an inherent property of an object, which does not change with the shape and position of the object, but only with the gravity coefficient.

So Xiao Ming is 5 kilograms in Shanghai on earth.

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