Matt spends 80 minutes washing the outside of his car and 1/4 that amount of time cleaning the inside. How long does he spend cleaning his car total?
First find the time Matt spends cleaning the inside of his car: 80 minutes / 4 = 
<gadget id="calculator">80/4</gadget>
<output>20</output>
20 minutes.
Then add that time to the time he spends cleaning the outside to find his total cleaning time: 20 minutes + 80 minutes = 
<gadget id="calculator">20+80</gadget>
<output>100</output>
100 minutes.

<result>100</result>