book Maths Puzzle Numerical Ability

How many gallons of 40% acid solution must be mixed with 30 gallons of 16% solution to obtain solution of 30% acid?

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please help me solve this problem:
Mike and Ela each has some money in the bank which pays interest at the rate of 4% per year. They use the total interest each year whi hey ths is ashley i have u major qustion will you help me on this question -2/5(10x-25)=8x+4