Libby has 160 quarters in her piggy bank. She has to pay $35 to replace her sister’s dress that she borrowed and ruined. After replacing the dress, how many quarters will Libby have left?
There are 4 quarters in every dollar, so $35 x 4 = 
<gadget id="calculator">35*4</gadget>
<output>140</output>
140 quarters.
Libby has 160 quarters - 140 quarters to repay her sister = 
<gadget id="calculator">160-140</gadget>
<output>20</output>
20 quarters left.

<result>20</result>