exam Maths Puzzle Numerical Ability

i dont understand how to rationalize 5+2^3/7+4^3 .please help me with this sum. thanks!

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exam Other Question

245 greater than 250 less than 255 I need help with this. Please
a) A collection of all the objects to be studied is a sample false (population)

b) A subset or part of the subjects to be studied is a sample tru