Question

Q. The average of 5 consecutive odd numbers A, B, C, D, E is 21. What is the product of B and C?

• A. 399
• B. 499
• C. 900
• D. 210

Answer 1

The correct option is A 399

Explanation:

Let the consecutive odd numbers be $x,x+2,x+4,x+6$ and $x+8$

$(x+x+2+x+4+x+6+x+8)/5=21$

$5x+20=105$

$x=17$

$A=17$

$B=19$

$C=21$

$D=23$

$E=25$

Therefore product of B and $C$ is $399$