Seven years ago the average age of a family of 2 members was 21 years. A child has been born. due to Which the average age of the family is 23 years today. What is the present age of the child?
Choose the correct choice from the following options:
A) 10years  B) 13years  C) 15years  D) 17years  E) 20years
Explanation:   Average of the family of two numbers   7 years ago = 21   = (21+ 7) * 2= 
<gadget id="calculator">(21+ 7) * 2</gadget>
<output>56</output>
56 years   Average age of the family of three members at present= 23 years   = 23 * 3= 
<gadget id="calculator">23 * 3</gadget>
<output>69</output>
69 YEARS   Age of child= 69 - 56= 
<gadget id="calculator">69 - 56</gadget>
<output>13</output>
13 years   Answer: Option 13years
<result>B</result>
Seven years ago the average age of a family of 2 members was 21 years. A child has been born. due to Which the average age of the family is 23 years today. What is the present age of the child?