exam Maths Puzzle Numerical Ability

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An electronics store wants to order at least 3 times as many DVD players as VHS players. Write an inequality expressing this relationshi

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find the product 4-b^2 divided by ab^2 times (a^2b)(a+2) divided
by -b-2 a canoe can travel 15 mi/hr in still water. Going with the current, it can travel 20 miles in the same time that it takes to travel 10 miles against the current. Find the rate of the current