Question

If the average of the first seven consecutive positive integers is "a" and that of the first nine consecutive positive integers is "b". Then what be the value of the square-root of the squared difference of "a" and "b"?

Answer 1

Answer:

The average seven consecutive positive integers is 26. The smallest of these integers is:

A) 21

B) 23

C) 25

D) 26

Correct Answer:

D) 26

Description for Correct answer:

let the seven consecutive positive integers are x, x + 1, x + 2, x + 3, x + 4, x + 5, x + 6

x+x+1+x+2+x+3+x+4+x+5+x+67=26

7x + 21 = 182

7x= 161

x = 23