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### Answer with Explanation

Answer is 410.

**How?**

5 + 3 = (5-3)(5+3) = 28

9 + 1 = (9-1)(9+1) = 810

8 + 6 = (8-6)(8+6) = 214

similarly

7 + 3 = (7-3)(7+3) = 410

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Answer is 410.

**How?**

5 + 3 = (5-3)(5+3) = 28

9 + 1 = (9-1)(9+1) = 810

8 + 6 = (8-6)(8+6) = 214

similarly

7 + 3 = (7-3)(7+3) = 410

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Answer is 108.

**How?**

2 + 3 = 2 *(2+3) = 10

8 + 4 = 8*(8+4) = 96

7 + 2 = 7*(7+2) = 63

6 + 5 = 6*(6+5) = 66

9 + 3 = 9*(9+3) = 108

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Answer is 3.

**How?**

It simple, but you have to think more then the math ðŸ™‚

1 = one = 3 letters

2 = two = 3 letters

3 = three = 5 letters

4 = four = 4 letters

5 = five = 4 letters

6 = six = 3 letters

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Answer is 16.

**How?**

Its a little trickier one then others.

sqr root(64) * 5 = 40

sqr root(81) * 7 = 63

sqr root(16) * 4 = ? = 16.

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Answer is 6.

**How?**

It is the simple subtraction as we used to do in our early maths classes in our childhood, so just reminds us of those days of taking carry and subtracting.

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Answer is 9.

**How?**

Here, every element in second row = corresponding column element in first row * 2.

Similarly every element in third row = corresponding column element in first row * 3.

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Answer is 30.

**How?**

Sum of the numbers on vertices of a triangle should be 90, i.e. 20 + 40 + ? = 90 => ? = 30.

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Answer is 6.

**How?**

Here, Number in a block is sum of the number on the top and right block so 7 = 1 + ?, hence ? should be 6.

Answer is 0 OR 16.

**How?**

Here, there is no special pattern except that they are continuous numbers which are jumbled up, so the missing number can either be 0 or 16.

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Answer is 9.

**How?**

Here, every middle element is the sum of the other two so answer should be 6+3 = 9.