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Find the Missing Number in These Triangles?

Find the Missing Number in These Triangles
Mathematics is very interesting subject. However it depends upon the way it is kids learn mathematics. If we teach kids math in an interesting way, they will love mathematics. Solving puzzles is very fun way to learn Mathematics. One can have fun solving Mathematical Brain Teasers and also learn basics of Maths. Here are some brain teasers which can be used by school going kids and teens to learn basics of mathematics. 
In each of the Triangle Brain Teaser, three triangles are given. Each corner of the triangle as well as center of the triangle contains number. One of the number in one of the triangle is replaced with question mark.  These numbers has some relationship with each other. One has to find this relationship and find the number which will replace the triangle. So are you ready to find which number replaces the question mark in each triangle?

Answers of these puzzles will be provide later once few of the visitors try out these puzzles and post their comments.
Easy Brain Teaser Triangles Math
1. Find the Missing Number in 3rd Triangle?

Quick Riddle Triangle Math
2. Which Number will replace question Mark?

Triangles Math Brain Teaser
3. Find Number which will replace the question mark?

Test Your Brain Triangle Math Brain Teaser
4. Test Your Brain by Finding missing number at Question Mark?

Genius Puzzle Triangle Math
5. Which number will replace center of the triangle?


Here is answer to 6th Brain Teaser Question of post titled "Simple Math Riddles for Teens and Kids with Answers to Twist your Brain".
I have hidden this answer to avoid any spoiler. Do select the text below to read the answer.

Answer is 41
IF A+B=D Then Answer D is drives from reverse the result of AxB.


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