Milly is figuring out how long she needs to spend studying. She knows that her math homework will take 60 minutes. Her geography homework will take half as long as her math homework, and her science homework will take time equal to the mean amount of time she spent studying math and geography. How many minutes does Milly spend studying?
First find how long Milly spends studying geography by dividing her math homework time by 2: 60 minutes / 2 = 
<gadget id="calculator">60/2</gadget>
<output>30</output>
30 minutes.
Now find the total amount of time Milly spent on math and geography: 30 minutes + 60 minutes = 
<gadget id="calculator">30+60</gadget>
<output>90</output>
90 minutes.
Now calculate the mean amount of time Milly spends on math and geography by dividing the total time spent by the number of subjects, which is 2: 90 minutes / 2 = 
<gadget id="calculator">90/2</gadget>
<output>45</output>
45 minutes.
Now add the time Milly spent on all three subjects to find the total: 45 minutes + 30 minutes + 60 minutes = 
<gadget id="calculator">45+30+60</gadget>
<output>135</output>
135 minutes.

<result>135</result>