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Q: Express 20 as a sum of 2 prime numbers?

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-20

7+3=10 17+3=20 17+13=30

They are: 2+7+11 = 20

3 and 17

It is 75.

148

17 and 3 are two prime numbers whose sum is 20. Their product is 51.

(2,3) and (2,5) are the two pairs such that the sum of their elements is a prime number.

There is only one even prime number: 2. So, representing 20 as a sum of even prime numbers would be 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2.

The largest prime less than 20 is 19. The largest prime over 60 is 61. The sum of these two numbers is 80.

17

The prime numbers between 4 and 20 are 5, 7, 11, 13, 17 and 19. Their sum is 72.

To find the HCF, you first have to express both numbers as the product of their prime factors: 15 = 3x5 20 = 2x2x5 The next step is to identify any common prime factors. In this case both numbers have a 5 as a prime factor. Therefore the HCF of 15 and 20 is 5.

It is 1.

The sum is: 23+29+31+37 = 120

17

23+29 = 52

There is only one prime number and it is '2' You cannot have any other even prime number

2 + 3 = 5

They are: 3+5+11 = 19

11 + 13 + 17 +19 = 60

The answer is 52.

38

Prime numbers >20 and <30 are 23 and 29. Total value 52.

600 * * * * * It is, in fact, 639

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