
Sanjay S. answered 01/13/15
Tutor
4.9
(34)
Expert, Patient and Motivated Tutor for Math, Science and Test Prep
Audie,
Let your sales be $x and friends be $y
x = 2y -5
Also x-y = 8
Substituting for x in second equation, 2y-5-y =8
or y = 13
x = 21
The product of sales is 13*21 = 273