book Maths Puzzle Numerical Ability

thrice a certain number added to 8 times the same number

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A chemist wants to mix a 75% acid solution with a 35% acid solution to produxe 400 ml of a 50% acid solution. How many ml of each solution should he use? Could someone show me how to do this problem? Thank you. is this a solution of the equation 2(x-2)-5x=5(2-X);7