exam Maths Puzzle Numerical Ability

I am having some trouble getting the answer to this problem could someone help me?
A 25in T.V. set has a width of 20in, what is the height of the T.V.?

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exam Other Question

x+5y=10
-2x-10y=-20

5y=x+10
divide by 5, each side
y=x+10/5
y=x/5+10/5
Problem with LCM
I then plug y into next equation
-2x-10(y equation)+ -10 (y equation)=-20
Need help to make sense out of LCM to finish problem 12.51 Do stock prices of competing companies move together? Below are daily closing prices of two

computer services firms (IBM = International Business Machines Corporation, EDS