When it's bad luck to meet a black cat?

Replace the question mark with the correct number in the below-given picture?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

A tourist visits a small town for his research. While in the town, he decides to get a haircut. Since the town is quite small, there are only two barbers in the town � one on the North Street and one on the South Street. The barbershop on the North Street is a mess and the barber has a weird and pathetic haircut. While the barbershop at the South Street is pretty tidy and the barber as well has an impressive haircut.

Which barbershop will the tourist visit for his haircut and why?

What goes up but never comes down?

Spot 5 differences in two Christmas tree below:

What Deficiency does the below rebus represent?

VIT_MIN