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.
Please read my explanation to your later problem. Then, post your answer here and I'll check it.
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
To determine the fraction of whole numbers in the set from 20 to 29 that have two integers that add up to 7, we need to count the number of possibilities and compare it to the total number of integers in the set.
To find two integers that add up to 7, we can first list the possible pairs within the set:
20 + 7 = 27
21 + 6 = 27
22 + 5 = 27
23 + 4 = 27
24 + 3 = 27
25 + 2 = 27
26 + 1 = 27
27 + 0 = 27
28 + (-1) = 27
29 + (-2) = 27
From this list, we can see that there are 10 possibilities where two integers from the set add up to 7.
The given set from 20 to 29 has a total of 10 integers, so the fraction of integers that have two integers adding up to 7 is 10/10, which simplifies to 1/1.
However, none of the answer choices correspond to 1/1, so there seems to be an error. Please recheck the answer choices provided.