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18 March, 13:59

Zoomfast Tire & Battery stores are selling new steel-belted radial tires. They promise that when these tires are used your car will get 10% better gasoline mileage. If Gloria's red convertible now goes 420 miles on a tank of gasoline, how far could she drive on a tank if she switched to the new tires?

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Answers (2)
  1. 18 March, 16:47
    0
    462 mi

    Step-by-step explanation:

    Gloria gets 420 mi/tank.

    10 % of 420 is

    420 * 0.10 = 42 mi

    She will be able to drive an extra 42 mi.

    420 + 42 = 462 mi

    With her new tires, a tank of gas will take her 462 mi.
  2. 18 March, 16:58
    0
    462

    Step-by-step explanation:

    to find 10% of 420 you take

    420 x. 10 = 42

    then add 42 to 420

    420+42=462
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