Princeton had a gender reveal party and invited all of his fellow employees to celebrate with him. If the total number of guests were 60, and 2/3 were male guests, how many female guests attended the party?
The number of males in the party was 2 males / 3 guests * 60 guests = 
<gadget id="calculator">2/3*60</gadget>
<output>40</output>
40 males.
If the total number of people at the party was 60, then there were 60 guests - 40 males = 
<gadget id="calculator">60-40</gadget>
<output>20</output>
20 females.

<result>20</result>