Question

3.The average of 7 consecutive numbers is 20. The largest of these numbers is A. 21 B22 C.23 D.24

Answer 1

let seven consecutive numbers be x, x+1, x+2, x+3,x+4,x+5 and x+6
then (x+x+1+ x+2+x+3+x+4+x+5+x+6)÷7=20
or( 7x +21)/7=20
or 7x +21=140
or 7x=119
or x=17
then the largest number be 17+6=23
Answer be D.23

Answer 2

Answer:c. 23

Explanation:

Actually there is a simple way to find the average that is the middle number is always a average. In these case they given a 7 consecutive number's average is 20 .so we first write seven numbers as 20 comes in the middle. 17,18,19,(20), 21,22,23 . Therfore the largest number is 23