Nani is 8 years old. His brother is twice his age. Nani's sister is 25% younger than him. What is the total age of all three of the family members?
Nani's brother is 8 * 2 = 
<gadget id="calculator">8*2</gadget>
<output>16</output>
16 years old.
Nani's sister is 25/100 * 8 = 
<gadget id="calculator">25/100*8</gadget>
<output>2</output>
2 years younger than he is.
That means she is 8 - 2 = 
<gadget id="calculator">8-2</gadget>
<output>6</output>
6 years old.
In total all mentioned family members, are 16 + 6 + 8 = 
<gadget id="calculator">16+6+8</gadget>
<output>30</output>
30 years old.

<result>30</result>