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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

 Aug 7, 2020
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Blue pen cost     .6

Red pen =        .6 d

 

.6 (3)  +  .6d (6) = 10.80

d = 2.5    

 Aug 7, 2020

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