The average age of a class of 6 girls is x years. Four new girls having ages x-2, x+4, x+8 and x + 10 joins the class. What is the new average age of the class?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. x + 2.
Total age of the initial 6 girls = x × 6 = 6x years
Total age of the four new girls = (x - 2) + (x + 4) + (x + 8) + (x + 10) = 4x + 20 years
Total number of girls = 10
New total age of the class = 6x + (4x + 20) = 10x + 20 years
New average age = (10x + 20)/10 = x + 2 years