+234 Jacob bought two types of pens: blue pens that cost 0.60 each and red pens that each cost d times as much as a blue pen. If the cost of 3 blue pens and 6 red pens was $10.80, what is the value of d?
There are no answer choices for this questions as it was free responce but i got my answer as 1.5 and the right answer was 2.5.
My work:
0.6(3)+d(6)=10.8
d=1.5
+36916 Blue pen cost .6
Red pen = .6 d
.6 (3) + .6d (6) = 10.80
d = 2.5
