The average age of husband, wife and their child 3 years ago was 27 years and that of wife and the child 5 years ago was 20 years. What is the present age of the husband?  Choose the correct choice from the following answers:
A) 30
B) 40 years
C) 20
D) 50
E) 25
Let the present age of the husband = h   Present age of the wife = w   Present age of the child = c   3 years ago, average age of husband, wife and their child = 27   =&gt; Sum of age of husband, wife and their child before 3 years = 3 × 27 = 81   =&gt; (h-3) + (w-3) + (c-3) = 81   =&gt; h + w + c = 81 + 9= 
<gadget id="calculator">81 + 9</gadget>
<output>90</output>
90 --- equation(1)   5 years ago, average age of wife and child= 20   =&gt; Sum of age of wife and child before 5 years = 2 × 20 = 40   =&gt; (w-5) + (c-5) = 40   =&gt; w + c = 40 + 10= 
<gadget id="calculator">40 + 10</gadget>
<output>50</output>
50 --- equation(2)   Substituting equation(2) in equation(1)=&gt; h + 50 = 90   =&gt; h = 90 - 50= 
<gadget id="calculator">90 - 50</gadget>
<output>40</output>
40   i.e., Present age of the husband= 40   Answer is 40 years.
<result>B</result>
The average age of husband, wife and their child 3 years ago was 27 years and that of wife and the child 5 years ago was 20 years. What is the present age of the husband?