exam Maths Puzzle Numerical Ability

Which is equivalent to 6ab2 - 3ab + 4a2b + 5ab - 5ab2 + 9a2b?

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exam Other Question

I need some help on how to solve a mixture solving problem.

How many gallons of 65% antifreeze and how many gallons of 20% antifreeze should be mixed to obtain 50 gallons of a 56% mixture of antifreeze?

Thank you! f(x)=1/4x+2