exam Maths Puzzle Numerical Ability

I am given the problem of to find the surface area of a rectangular prism. All that is given is a lengt of 5 a height of 10 and a width of 7. How do i find the surface area

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exam Other Question

Compare equations with one variable to equations with two variables.
How are they alike? How are they different?
What if an equation had three variables? a goldsmith has two alloys of gold, the first being 70% pure and the second being 60% pure. how many ounces of the 60 pure gold must be used to make 100 ounces of an alloy which will be 66% gold?