Question

the average age of 4 men is 60 years find the age of the fourth man if the ages of the first three men are 65, 45 and 75.​

Answer 1

Let'stake that the age of 4th man is x.

Then,

(65+45+75+x)÷4=60

(185+x)÷4=60

185+x=240

x=55

The age of 4th man is 55.

Answer 2

Answer:

(65+45+75+X)/4=60

(185+X)=240

X=240-185

X=55