Hint: It’s more of a counting puzzle then a calculation puzzle.
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Solution:
There are 2 ways to look at this puzzle.
Solution No: 1
1919 is equal to 2.
9999 is equal to 4 so each 9 is equivalent to 1.
1212 is equal to 0 so 1 and 2 are equivalent to 0.
Therefore, 1919 is (0+1+0+1), so it is equivalent to 2.
Solution No: 2
The puzzle needs you to calculate the number of circles in the numbers.
eg: 9 has one circle in it and 8 has 2
that why;
9999=4 (each 9 has 1 circle)
8888=8 (each 8 has 2 circles so 2 x 4 = 8)
1816=3 (8 has one circle and 6 has 1 so 2)
1212=0 (no circles in 1 & 2)
Hence, 1919=2 ( 2 circles of the number 9)
