book Maths Puzzle Numerical Ability

A chemist used a portion of an acid solution containing 80 ml of an 8% acid solution and 120 ml of a 12% acid solution, and replaced it with a 10% acid solution. If the concentrati

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Hi! Mathematicians..i hope you can help me solve the following problems with solutions so i can review the answers. thanks!

18) How many square kilometers is a rectangular fie [52.4-(16.1/3.6] - 30.2

I don't get how to do this. / means divide