Allen is 25 years younger than his mother. In 3 years, the sum of their ages will be 41. What is the present age of Allen's mother?
In 3 years, the sum of their present ages will be added by 3 (from Allen) + 3 (from her mother) = 
<gadget id="calculator">3+3</gadget>
<output>6</output>
6.
So, the sum of their present ages is 41 - 6 = 
<gadget id="calculator">41-6</gadget>
<output>35</output>
35.
Let x be the present age of Allen's mother and x - 25 be the present age of Allen.
So the equation using the sum of their present ages is x + x - 25 = 35.
By combining like terms, the equation becomes 2x = 60.
Hence, Allen's mother is x = 60/2 = 
<gadget id="calculator">60/2</gadget>
<output>30</output>
30 years old now.

<result>30</result>