exam Maths Puzzle Numerical Ability

Solve.

a(a+5)(a-5)

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exam Other Question

Suppose you own a card shop. You buy one line of cards at a rate of 4 cards for $5. You plan to sell the cards at a rate of 3 cards for $5. How many cards must you sell in order to make a profit of $100. i do not even know where to begin on this problem