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In the set of all whole numbers from 20 to 29,what fraction have two integers which add up to 7?

A.1/9
B.1/10
C.5/10
D.9/10

20, 21, 22, 23, 24, 25, 26, 27, 28, 29

I only see one set of digits whose sum is 7.

IDK that's why i need help last yr. our teacher didn't teach us any of this so it is difficult.

plz help me i don't get this at all and i've never done it b4 and i really need help

http://www.jiskha.com/display.cgi?id=1317077656

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