exam Maths Puzzle Numerical Ability

I need to find the maximum and minimum volumes of these equations in order to find the max and min of the boxes.

a. v(x)= x(39-2x)(53-2x)
b. v(x)= x(38-2x)(55-2x)
c. v(x)= x(

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exam Other Question

The sum of two numbers is 64. If twice the smaller number is subtracted from the larger number, the result is 16. Find the two numbers.

THANKS FOR YOUR HELP:) AB+CD=EFG
Each letter represents a different digit. What digit does E represent. Explain your answer.

This is a problem from my geometry class and I think the answer is 5 however I am not certain. Thank you for your help.