Question

Solve this question​

Answer 1

Answer:

(2) 19

Step-by-step explanation:

let the first consecutive no. be x

So,

x+(x+1)+(x+2)=57

x+x+1+x+2=57

3x+3=57

3x=57-3

3x=54

x=54÷3

x=18

So, the three consecutive no. are 18,19,20

Average of 1st and 3rd no.=(18+20)/2

=38/2

=19