Question

the Average of 7 numbers is 50,
average of first fourt 4 number is 40 and
last 3 numbers is 30 What is that 7 digit number? ​

Answer 1

Answer:

The answer is 50. Consider a,b,c,d,e,f,g are the seven numbers. Given, (a+b+c+d+e+f+g)/7= 50 which is eqn1. , (a+b+c)/3=40 which means a+b+c=120, and (e+f+g)/3=60 which means e+f+g=180. d+300=350 which implies d=50.30-Nov-2018