exam Maths Puzzle Numerical Ability

if A and B are nxn matrices and AB=0. Show that rank(A)+rank(B)is less than or equal to n.

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exam Other Question

0.5 over a = 1.25 over 5 what is a? a store owner had 225 suits. at the end of a sale he had sold 4/5 of them. How many suits were left?