Bonny just bought her 13th pair of shoes, which is 5 less than twice as many pairs of shoes as Becky owns.  Bobby has 3 times as many pairs of shoes as Becky has.  How many shoes does Bobby have?
Let x be the number of pairs of shoes that Becky owns.
Since 13 pairs is 5 less than twice as many pairs as Becky owns, then the relationship is 2x-5=13.
Adding 5 to each side of the equation, we get 2x=18.
Solving for x, we get x=
<gadget id="calculator">9</gadget>
<output>9</output>
9.
Since Bobby has 3 times as many pairs of shoes as Becky has, then Becky has 3*9=
<gadget id="calculator">3*9</gadget>
<output>27</output>
27 pairs of shoes.

<result>27</result>