Question

How many numbers between 11 and 111 are the multiples of both 2 and 5

Answer 1

If a number is multiple of 2&5 it is a multiple of 10 because 2&5 are co-primes.
So the answer is 10(20,30,40,50,60,70,80,90,100,110)

Answer 2

There are 10 numbers in between 11 and 111 that are divisible by both 2 and 5.

Step-by-step explanation:

Multiples are numbers which are the product of integers, extended tables. For example a is the multiple of b implies b can be expressed in terms of a.

Example: 14, 21, 35, 49 are the multiples of 7

Multiples of two numbers implies the numbers have to be expressed in terms of 2 and 5 both (product of 2 and 5 = 10)

The resultant numbers should be expressed in terms of 10.

Let us consider the numbers between 11 and 11 which are multiples of 10.

20, 30, 40, 50, 60, 70, 80, 90, 100, 110 are the numbers divisible by both 2 and 5.

So, there are 10 numbers in between 11 and 111 that are divisible by both 2 and 5.