book Maths Puzzle Numerical Ability

Find the area of a triangle with na altitude of 13 mters and a base of 25 meters What is the cost to construct such a traingle of sheet metal that costs $4.50

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Please help me with this problem.Crammer's Linear System.
3x + 5y = 8
4x + 7z = 18
y + z = 3

Thanks for your time. I really appreciate it. Solve each if domain is( 1,2,3,4,5,6,7,8,9):
(6-v)(1+v)v=0
y(8-y)=0