The average of 7 consecutive numbers is 20

Asked by admin @ 26/08/2021 in English viewed by 304 People

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

Answered by admin @ 26/08/2021

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

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