exam Maths Puzzle Numerical Ability

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Find -x when x=20

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1. The equation y = - 1777x + 27, 153 can be used to predict the number y of gun deaths in the United States x years after 2000, that is x = 0 corresponds to 2000, x = 2 correspon Sales: A dealer bought some radios for a total of $1200. She gave away 6 radios as gifts, sold each of the rest for $10 more than she paid for each radio, and broke even. How many radios did she buy?