Fiind the number

If 21 is added to the number first number of two given numbers, it becomes twice the second number and if 12 is added to the second number, it becomes twice the first number. Find the numbers.

The thickness of a hemispherical bowl is 0.25cm. The inner radius of the bowl is 5cm. Fiind the outer curved surface area of the bowl.(Take pi=22/7 )

The number of zeroes at the end of the square of a number is _______ the number of zeroes at the end of the number

On the number line, the number of rational numbers between any two rational numbers is

Property 2 The number ends in an odd number of zeros then it does not have a square root.If a square number is followed by an even number of zeros it has a square root in which the number of zero in the end is half the number of zero in the number.

The sum of two digit number and the number obtained by reversing the digits is 66. If the digits of the number differ by 2, Find the number. How many such numbers are there?

The sum of two digit number and the number obtained by reversing the digits is 66. If the digits of the number differ by 2, Find the number. How many such numbers are there?

The sum of two-digit number and the number obtained by reversing the digits is 66. If the digits of the number differ by 2, find the number. How amny such numbers are there?

Following results were obtained by rolling a die 25 times. Fiind the range of the data.