Question

if a+b+c+d=2012 and b+d=2013 what is the value of a-b+c-d?

Answer 1

a+b+c+d=2012 and b+d=2013 it means a+c=-1 so a-b+c-d=a+c-(b+d)= -1-2013= -2014

Answer 2

i think this is correct answer