book Maths Puzzle Numerical Ability

what is the sum of the maximum and minimum values of Z=24x+12y subject to the contraints 2x+4y > or = to 8, 4x-y < or = to 16, and -2x+5y < or = to 10?

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book Other Question

Add The square root of 54 and the square root of 24 The distance an object falls is directly proportional to the square of the time it has been falling. After 6 seconds it has fallen 1296 feet. How long will it take to fall 2304 feet? I figured 1296 = x(6)square but not able to complete.