# Math

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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
and
x=cost of each orange

We will set up the equations

15x=r+90
10x=r-60

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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