Hello Steemenians,

Introducing My Self; I am a Maths Teacher.

Dear Steemit Users, Solve This Maths Skills Puzzle Game Contest 55.

Reply, Which number replaces the question mark?

Options:

A.  9
B.  10
C.  13
D.  7 

I hope you will help me to solve this and reply with your answer.

Reward:
Who Upvote this post & give Right answer, I will Upvote their latest post on their blog page.

@swaticute