book Maths Puzzle Numerical Ability

The parking lot at George's Grocery is 60ft. long and 40ft. wide. George plans to expand the parking lot by increasing the length and width by the same amount (x).

1.Write an ex

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What is the coefficient, the like term, and the constant of a+2a+3a-4a? I need help now. 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.