3 Years ago, the average age of a family of 5 members was 20 years. A baby having been born, the average age of the family is the same today. The present age of the baby is  Choose the correct choice: A) 1 year. B) 1.5 Years. C) 2 Years. D) 3 Years. E) 5 Years.
We're told that 3 YEARS AGO, the average age of a family of 5 members was 20 years.   This means that the SUM of their ages was (5)(20) = 100 years.   A baby was born (meaning that there are now 6 family members). We're told that the PRESENT average age of the family members is the SAME.   This means that the sum of the ages is (6)(20) = 120 years.   We're asked for the PRESENT age of the baby.   Since each of the original 5 family members has aged 3 years since the initial average was calculated, the sum of their PRESENT ages is...   100 + (5)(3) = 115.   120-115= 
<gadget id="calculator">120-115</gadget>
<output>5</output>
5   5 Years.
<result>E</result>
3 Years ago, the average age of a family of 5 members was 20 years. A baby having been born, the average age of the family is the same today. The present age of the baby is