Omi is twice as old as Kimiko. Arlette is 3/4 times as old as Kimiko. If Kimiko is 28 years old, calculate the average age of the three?
If Kimiko is 28, Omi is 2 * 28 years = 
<gadget id="calculator">28*2</gadget>
<output>56</output>
56 years old.
Arlette is 3/4 * 28 years = 
<gadget id="calculator">3/4*28</gadget>
<output>21</output>
21 years old.
If you add up their ages, it sums to 21 years + 56 years + 28 years = 
<gadget id="calculator">21+56+28</gadget>
<output>105</output>
105 years.
The average age for the three is 105 years / 3 people = 
<gadget id="calculator">105/3</gadget>
<output>35</output>
35 years/person.

<result>35</result>