Problema Solution
A textbook store sold a combined total 415 chemistry and psychology textbooks in a week.The number of chemistry textbooks sold was 77 more than the number of psychology textbooks sold. How many textbooks of each type were sold.
Answer provided by our tutors
let
c = the number of chemistry textbooks sold
p = the number of psychology textbooks sold
a textbook store sold a combined total 415 chemistry and psychology textbooks in a week
c + p = 415
the number of chemistry textbooks sold was 77 more than the number of psychology textbooks sold
c = 77 + p
by solving the system of equations
c + p = 415
c = 77 + p
we find
c = 246 chemistry textbooks
p = 169 psychology textbooks
click here to see the step by step solution of the system of equations
there were 246 chemistry textbooks and 169 psychology textbooks sold.