book Maths Puzzle Numerical Ability

an isosceles triangle has an area of 200 square units, and the altitude to the base measures 10 units. what is the perimeter of the triangle?

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book Other Question

An example of an invertible 1x1 matrix. An example of a noninvertible 2x2 matrix with 1s on the main diagonal.
A cake is removed from a oven at 325F and cools to 150F after 25 minutes in a 68f room. How long will it take to cool to 115F?