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

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?

(444% of 521) ÷972=?

Out of six consecutive natural numbers, if the sum of first three is 27, what is the sum of the other three? 

The product of two positive numbers is 11520 and their quotient is $$9\over5$$.Find the difference of two numbers?

If the arithmetic means of 3a and 4b is greater than 50, and a is twice b, then the smallest possible integer value of a is: 

Sum of two numbers is thrice their difference. Their ratio is 

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: