exam Maths Puzzle Numerical Ability

a store owner had 225 suits. at the end of a sale he had sold 4/5 of them. How many suits were left?

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exam Other Question

if A and B are nxn matrices and AB=0. Show that rank(A)+rank(B)is less than or equal to n. I need help solving this equation step-by-step. Please help me.
(((The perimeter of the retangular is 320ft if the length is 5ft shorter than twice the width. Find its length and width.)))