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Parallel calculation of solving mathematical application problems
1 Solution: If each basket of pears weighs X kilograms, then each basket of apples is (x+5) kilograms.

6x+6(x+5)=390

The solution is x=30.

A: Each basket of pears weighs 30 kilograms, and each basket of apples weighs 35 kilograms.

2. Solution: Suppose that bottle A of alcohol should be poured into bottle B of X ml.

470-x=2( 190+x)

The solution is x=30.

Answer: a bottle of wine should be poured into 30 ml bottle B.

3. Solution: If Zhang San has x geese, then he has 3x ducks.

x+3x= 15

The solution is a fraction, there is a problem and there is no solution.

4. solution: it takes x days to complete the armor alone.

1/30+ 1/x = 1/20

x=60

Answer: A completes it every day 1/60, and it takes 60 days for one person to complete it.