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.