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 ?

x - 2 x + 2  x + 5 x + 1

x + 2

Sum of ages of 6 girls = 6x Sum of ages of 4 new girls = 4x + 20 Average age of class = \(\frac{10x + 20}{10}\) = x + 2