exam Maths Puzzle Numerical Ability

the perimeter of a rectangle is 66m if the width were double and the length were increased by 22m, the perimeter would be 136 what is the length and width of the rectangle

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In a large consignment of mangoes 2% are rotten. What is the probability that a carton of 96 mangoes will contain less than two rotten mangoes?

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Algebra Placement Test Sample.
The question reads as follows.

11.For all nonzero r,t, and z values, 16r^3tz^5/-4rt^3z^2=?

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