exam Maths Puzzle Numerical Ability

How to simplify: - 1/2 + 3/8 + (-6) + 3/4

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Sam found a number of nickels, dimes, and quarters in his room. He found three more dimes than nickels but twice as many quarters as dimes. The total value of the coins was $5.05. How many coins of each type did Sam find? 24 Welding: The parts bin is a rectangle 1 ft on the end, 2 1/2 ft long, and 6 in high. On a 16 guage sheet metal. Calculate the volume in cubic feet and the total length of weld n