book Maths Puzzle Numerical Ability

Find the area of the triangle with an altitude of 13 meters and base of 25 meters What is the cost to construct such a traingle out of sheet metal that cost $4.50 per square meter?

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book Other Question

What is the formula for compound interest? Need to find out how much someone will make if invest $1000 per year for 37 years at 12% interest per year? The swinomish planning office has 300 feet of fencing and wants to enclose a rectangular area of 3600 square feet to protect a cultural site. What should the length and width of the fenced area be.