​Select the smallest natural number that should be added to or subtracted from the sum of the squares of 15 and 16 to make it a perfect square?

The product of two consecutive positive multiples of 5 is 750. What is the smaller of the two numbers?

The product of two consecutive even numbers is 624. What is the sum of the two numbers?

When $$100^{25}-25$$ is written in decimal notation, then the sum of digits will be

If $$N=3^{10}+3^{11}+3^{12}+3^{13},$$​then how many positive factors does N have ?

The sum of the squares of two positive integers is 1025 and difference of their squares is 225 . The difference of the numbers is what percent of the product of these numbers ?

The sum of five consecutive multiples of 8 is 560. The smallest multiple is

A two-digit number is 4 times the sum of its digits and twice the product of the digits. The number is:

​The product of the predecessor of 201 and the successor of 4781 is:​

The number of positive prime integer <50 is