exam Maths Puzzle Numerical Ability

This is 5th grade math and I have TOTALLY forgotten how to do this stuff!!! Please try to explain to me how to solve and check this type of a problem, so I can remember how to do this!!!

x/5=20/4

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exam Other Question

Hi. I need some help with the following problem. Thanks

Use the given information to find the constant of proportionality.
S varies jointly as p and q. If p = 3 and q = 7, then S = -21.

k = I had problems with this on my GED and i needed to know can you help me with so that i can get the 10 points i need to get my GED?