Question

the average of 5 consecutive numbers is 18 the highest of these number will be

Answer 1

Let the the numbers be x - 2, x - 1, x, x + 1, x + 2
Add the numbers u get

5x/5 = 18
x = 18
x + 2 is the highest no which is 20

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Answer 2

AVERAGe=Sum/Total Numbers

Let Consecutive Numbers be=x,x+1,x+2,x+3,x+4

Why We take x+2,x+2
As if first=1 then second=1+2=2
Got it.
Now

Average=18
Sum=x+x+1+x+2+x+3+x+4=5x+10
Total Number=5
AVERAGe=Sum/Total Number
5x+10/5=18
5x+10=18×5
5x+10=90
5x=90-10
5x=80

x=80/5
x=16

Consecutive Number are =16,17,18,19,20

Highest=20