exam Maths Puzzle Numerical Ability

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?

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exam Other Question

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. What is the area of a rectangle with a length of 45 and diagonals of 51?