Wednesday

October 22, 2014

October 22, 2014

Posted by **damien** on Wednesday, November 10, 2010 at 6:06am.

- Math riddle -
**Writeacher**, Wednesday, November 10, 2010 at 7:07amPlease type your

__subject__in the**School Subject**box. Any other words,__including obscure abbreviations__, are likely to delay responses from a teacher who knows that subject well.

- 2nd grade -
**Dr Russ**, Wednesday, November 10, 2010 at 7:10amLets say the number is AB

so A+B=10

we also know that A<B

and both A and B are prime

so possibilities for A and B are

1,2,3,5,7

if A<B then A can only be 1,2,3,or 5

the only pairs such that A+B=10

are 55, 37

of these two only 37 is a prime number

But check the logic!

- 2nd grade -
**Anonymous**, Wednesday, November 24, 2010 at 7:33am1

- 2nd grade -
**gummy bear**, Wednesday, November 28, 2012 at 4:55pmgummy bear yaaaaa

**Answer this Question**

**Related Questions**

Mathe - The number has two digits. Both of the digits are even.the digit in the ...

5th grade math - i am a number greater than 40,000 and less than 60,000 my ones ...

Math - The mystery number's tens digit is less than the ones digit. The tens ...

math - i am a 4 digit number.my thousands didgit is 4 less than my tens digit.my...

Algebra - Math HW HELP! - 1) It is a five-digit whole number. 2) It is a ...

4th grade - i am a 5 digit number my tens digit is the sum of my hundreds digit ...

maths I need answer - A 2-digit number has a greater tens digit than the ones ...

Math - Iam a 5digit number my tens digit is the sum of my hundreds digits and ...

4th grade - I am a number between 75 and 150 My tens digit is three times my ...

math - my thousand digit is half my ones digit.my houndreds digit is odd and ...