Discussion Forum



1)

The average of 7 consecutive numbers is 20. The largest of these numbers is :


A) 20

B) 22

C) 23

D) 24

Answer:

Option C

Explanation:

Let the numbers be x,x+1,x+2,x+3,x+4,x+5,x+6
Average = $\frac{x+(x+1)+(x+2)+(x+3)+(x+4)+(x+5)+(x+6)}{7}=20$
7x+21 = 140
x= $\frac{140-21}{7}$
x=17
Latest number is x+6= 23