exam Maths Puzzle Numerical Ability

Can you please help me solve: A parking lot is to be formed by fencing in a rectangular plot of land except for an entrance 12 m wide along one of the sides. Find the demensions of the lot of greatest area if 300 m of fencing is to be used.

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exam Other Question

A company payroll is prepared by 2 computers in 13 and 1/3min. W orking alone, the faster of the 2 computers can prepare the payroll in 20 minutes. How much time does the slower computer alone require to prepare the payroll? find the least common multipleof the two expressions.

14t^3y^2 and 2t^9y^5z^9