book Maths Puzzle Numerical Ability

Suppose you have $350.62 to spend on a remodeling project. The floor tiles and curtains cost $180. Determine the amount of paint you can buy, in gallons, if the paint costs $13.50 per gallon.

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The instructions say divide. The problem is 4 / 7+i. I have come up with 7/12 + 1/12i. Is the the correct solution? THanks in advance. When the ancient Egyptians were building the great pyramids at Giza, they checked each course or level of stones to make sure they were being laid square by measuring th diagonals.