Question

In a yoga class there were 12 members.two members left the class and 4 new members joined.if the average age decreased by 4 years and the total age decreased by 2 years .what is the new average age of the class

Answer 1

average age of 12 members= x
total age =12x
2 members left and 4 members joined
total members =14
new average =x-4. (given)
total age. =12x-2 (given)
14(x-4)=12x-2
7(x-4)=6x-1
7x-28=6x-1
x. =27
new average =x-4
23