For what value of m will the system of equations 17x+my+102=0 and 23x+299y+138=0 have infinite number of solutions? 

How many three-digit numbers are there in which all the digits are odd? 

How may digit are required to write numbers from 1 to 50?

In a division sum, the divisor is 3 times the quotient and 6 times the remainder. If the remainder is 2, then the dividend is: 

Four numbers, when arranged in ascending order, are w, x, y and z. The average of the smallest three numbers is 25.5 while the average of the largest three was 29.5. What is the range of the data?

The number of integers in between 100 and 600, which are divisible by 4 and 6 both, is: 

What is the sum of all natural numbers between 100 and 400 which are divisible by 13? 

The greatest number less than 1500, which is divisible by both 16 and 18, is: