OpenStudy (anonymous):

if a-b=10,a+c=20,and b-c=30,then a=?

OpenStudy (ilovewolf):

do you have a answer choice?

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

A) 4 B)2 C)1 D)0

OpenStudy (ilovewolf):

etake a random guess

OpenStudy (anonymous):

?

OpenStudy (beccasmith):

It would be d