A group of people contains men, women, and children. The number of men is twice the number of women, and the number of women is 3 times the number of children. If the number of children is 30, how many people does this group contain?
The number of women in the group is 3 women/child * 30 children = 
<gadget id="calculator">3*30</gadget>
<output>90</output>
90 women.
The number of men in the group is 2 men/woman * 90 women = 
<gadget id="calculator">2*90</gadget>
<output>180</output>
180 men.
The total number of people in the group is 180 men + 90 women + 30 children = 
<gadget id="calculator">180+90+30</gadget>
<output>300</output>
300 people.

<result>300</result>