What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

I am working in a bus company. The company recently went under expansion and therefore there was not enough room for all the buses. As a result, twelve buses had to be stored outside.

If the company decides to expand the garage space by forty percent, enough space to accommodate the current buses will be created leaving enough space for twelve more buses if the need arises in future.

Can you calculate the number of buses that the company owns at present?

What can go up a chimney down, but can’t go down a chimney up?

Spot what is wrong here in below Picture?

When we see 2 but call 10?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

A beggar on the street can make one cigarette out of every 6 cigarette butts he finds. After one whole day of searching and checking public ashtrays the beggar finds a total of 72 cigarette butts. How many cigarettes can he make and smoke from the butts he found?