How many 3-digit natural numbers (without repetition of digits) are there such that each digit is odd and the number is divisible by 5?

here are five persons in a group — P, Q, R, S and T. The…

Candidates in a competitive examination consisted of 60% men and 40% women. 70% men and…

In a box of marbles, there are three less white marbles than the red ones…

A society consists of only two types of people — fighters and cowards. Two cowards…

A cow costs more than 4 goats but less than 5 goals. If a goat…