exam Maths Puzzle Numerical Ability

I need a little help with the following:

How many 2-inch square blocks can fit inside a rectaingle that is 10in. high by 20in long?

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exam Other Question

Determine which two equations represent parallel lines. Justify the answer.
(a) y = (5/7) x + 3
(b) y =(7/5) x + 5
(c) y = (7/5) x - 5
(d) y = -(5/7) x + 5 Could you please help me solve this question: In a right triangle, the length of the hypothenuse is 5 and the length of the legs is 3, determine the tangents of all three angles. Also find the distance between (1,3) and (5,6).

Thank you, very much.