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Puzzle 6:- How Many Squares? Ans:-26.
Sol:-Count Carefully.

Puzzle 7:- What number should replace the question mark? Ans:-9.
Sol:-The number at the centre of each triangle equals the sum of the lower two numbers minus the top number.

Puzzle 8:- What number should replace the question mark? Ans:-3.

Sol:-A+B=76 and A-B=38 then
A=57 And B=19
A/B=57/19=3

Puzzle 9:- What number should replace the question mark? Ans:-1.

Sol:-Multiply the bottom two numbers then take the square root, i.e.
1×4 = 4 and √4 = 2.

Puzzle 10:- What number should replace the question mark? Ans:-10.

Sol:-Each diagonal line of numbers, starting with the top left hand corner number, increases by 1 each time.
Example
4
2+3=5
2+1+3=6
2+1+2+2=7
4+1+3=8
5+4=9
10