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MathematicsMathematics
24 December, 06:56

1. A box of 80 coins, consisting of only nickels and dimes, is worth 7 dollars and 80 cents. Find the number of nickels.

2. Two drivers are 420 miles away from each other when they started moving towards each other. They meet after 4 hours. What is the speed of the first car, if the second car's speed is 45 mph?

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  1. 24 December, 07:09
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    4 nickels 60 mph

    Step-by-step explanation:

    1. If all were dimes, the value would be $8.00. The value is actually $0.20 less than that. Replacing a dime by a nickel decreases the value by $0.05, so there must be $0.20/$0.05 = 4 nickels.

    2. The total of the two speeds is the rate of closure: (420 mi) / (4 h) = 105 mi/h. The speed of the second car is found by subtracting the speed of the first car from this total:

    105 mph - 45 mph = 60 mph
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Home » Mathematics » 1. A box of 80 coins, consisting of only nickels and dimes, is worth 7 dollars and 80 cents. Find the number of nickels. 2. Two drivers are 420 miles away from each other when they started moving towards each other. They meet after 4 hours.
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