If `A(x)` denotes the number of prime number not greater than x, then what is the value of `A[A(100))​`

A prime number greater than 11 will never end with

The sum of prime number that are greater than 60, but less than 70 is

The number of rows in a lecture hall equals the number of seats in a row. If the number of rows is reduced by 10, the number of seats is increased by 300. If x denotes the number of rows in the lecture hall, then what is the value of x?

The number of all prime numbers less than 40 is ..

Write a prime number greater than 91 but less than 100.

If m is the number of prime numbers between 0 and 50, and n is the number of prime numbers between 50 and 100, then what is ( m-n) equal to ?

The LCM of two numbers is greater than the larger of the numbers.

If the LCM of two prime numbers 47 and x is 517, then the value of x is:

Every multiple of a number is greater than or equal to the number.