exam Maths Puzzle Numerical Ability

A rectangular animal pen with area 1200 m^2 has one side along a barn. The other three sides are enclosed by 100 m of fencing. Find the dimensions of the pen.

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The number -12.6 or in fraction form negative 63 over 5 is between two consecutive odd integers. What is the product of these two integers? Radioactive strontium-90 is used in nuclear reactors and decays exponentially with an annual rate of decay of 2.48%. How much pf 50 grams of strontium-90 will be left after 100 years?