book Maths Puzzle Numerical Ability

The area of a rectangular playground enclosed in Southshore Middle School is 600 square meters. The lenght of the playground is 10 meters longer than the width. Find the demensions

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At a temperature of 20 degree centigrade the common amoeba reproduces by splitting in half every 24 hours. if we start with a single amoeba how many will there be after (a) 8 days (b) 16 days? can you please help me figue out how to solve by graphing x=y=-1;3x-y=-7