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Mr. R has some money to buy oranges, if he will buy 15 oranges he will need $90 more, if he will buy 10 oranges he will have $60 left. how much money has mr. R?

  • Math -

    Let r=amount of money in dollars Mr. R has
    x=cost of each orange

    We will set up the equations


    You can then solve for r and x by the method of elimination, substitution, or comparison.

  • Math -

    Buying 5 more oranges costs an extra $150. Therefore they cost $30 each.

    Buying ten oranges costs $300 and leaves him with $60. Therefore he started out with $360.

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