The average age of 35 persons is 40 years. 5 new persons with an average age of 35 years joined them. The average age of all the persons is:
Answer & explanation
Correct answer: option 1
Sum of age of 35 person = 35 × 40 = 1400 years
After joining 5 persons of 35 years ,
Sum of 40 persons = 1400 + 5 × 35 = 1400 + 175 = 1575 years
Average of all = \(\frac{1575 }{40}\) = 39\(\frac{3}{8}\) years