MIT Math Graduate’s Daughter’s Age

This is a real Tough one even i could not crack it easily… Basically you have to use maths to solve this, while I was trying to use logic 😉 That is a hint by the way. The Riddle is as below; Two MIT math grads bump into each other at Fairway on the upper

Tough Number Puzzle: Find Missing Number

Tough puzzle, try and ans this: 9999=4 8888=8 1816=3 1212=0 1919=? Solve the puzzle. Hint: It’s more of a counting puzzle then a calculation puzzle. So were you able to solve the riddle? Leave your answers in the comment section below. You can check if your answer is correct by clicking on show answer below.