James and John combine their friends lists.  James has 75 friends.  John has 3 times as many friends as James.  They share 25 friends.  How many people are on the combined list?
John has 75*3=
<gadget id="calculator">75*3</gadget>
<output>225</output>
225 people on his friends list.
So that means there are 225+75=
<gadget id="calculator">225+75</gadget>
<output>300</output>
300 people on the list.
So once you remove duplicates there are 300-25=
<gadget id="calculator">300-25</gadget>
<output>275</output>
275 people.

<result>275</result>