exam Maths Puzzle Numerical Ability

add: -6+12+(-5)+3

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exam Other Question

Science and medicine. A passenger train can travel 325 mi in the same time a
freight train takes to travel 200 mi. If the speed of the passenger train is 25 mi/h faster than the speed of the freight train, find the speed of each. How do I do this?
The formula A=6V^2/3 gives the surface area of a cude in terms on its colume V. What is the volume of a cube with surface area of 12 square feet?

I come up with, 12=6(1)^2/3 So the colume is 1.
Am I correct?