exam Maths Puzzle Numerical Ability

A lazy caterpillar must decide if he wants to crawl from point y to point x so he can be in the sun or if he should just sleep until he blossoms to a butterfly and then fly to poin

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A wire of length x is bent into the shape of a circle. Express the circumference C of the circle as a function of x. The level of thorium in a sample decreases by a factor of one-half every 4.2 million years. A meteorite is discovered to have only 7.6% of its original thorium remaining. How old is the meteorite?