Question

If the sum of three consecutive natural nubers is $18$, then the second number is

• A. $5$
• B. $6$
• C. $7$
• D. $8$

Answer 1

The correct option is B $6$

The three consecutive numbers are 5, 6 and 7 (5+6=11, 11+7=18) . That implies that 7 is the greatest among the three

$\text{Let x, x+1 and x+2 be the three consecutive numbers}$

$\text{(x)+ (x+1) + (x+3) = 18}$

$3x+3=18$

$3x=18-3$

$3x=15$

$x=5$

thus ,

second number is x=1

$\text{i.e 6}$

$\text{Hence option B is correct.}$