# Write five pairs of prime numbers less than 20 whose sum is divisible by 5.

__Prime Numbers__ are the numbers with two factors, 1 and the number itself.

## Answer: Five pairs of Prime Numbers less than 20 whose sum is divisible by 5 are (2,3), (3,7), (2,13), (5,5), (3,17), (7,13)

According to the __Divisibility Rule __of 5, any number ending with 0 or 5 is divisible by 5.

## Explanation:

The numbers divisible by 5 are 5, 10, 15, 20, 25, ... (__Multiples of 5__)

Let's express these numbers as a sum of two prime numbers lesser than 20, that are, 2, 3, 5, 7, 11, 13, 17, 19

a) 5 = 2 + 3

b) 10 = 3 + 7

c) 15 = 2 + 13

d) 20 = 3 + 17

e) 20 = 7 + 13