Bridge and Sarah have $3 between them. If Bridget has 50 cents more than Sarah, how many cents does Sarah have?
Let X be the amount of money Sarah has, so Bridget has X + 50 cents.
We know that Sarah and Bridget combined have $3, or 300 cents, so X + X + 50 = 300.
We therefore know that 2X = 250.
So Sarah has 250 / 2 = 
<gadget id="calculator">250/2</gadget>
<output>125</output>
125 cents.

<result>125</result>