A pharmacist combines ingredients x,y and Z surrounded by a ratio of 1:2:7 to produce cough prescription, How several ounces of?

A pharmacist combines ingredients x,y and Z in a ratio of 1:2:7 to produce cough medicine, How many ounces of the second ingredient, ingredient y, is needed to fashion a 12ouce bottle of the medicine.
a) 2.2 b)8.4 c)1.2 d)3.6
Answers:
c) 1.2

x1.2 +y 2.4 + z8.4 = 12

1:2:7

but the question doesn't make sense

Related Questions:
Is it protected to swallow a solution made for injection?   Diarex's Effects on EnbrelSureclick?   Difference contained by Hemoglobin Levels?   Where can I find irrefutable evidence on the efficiency of manipulate? Is wipe a psudoscience?   The lay down read: Over the subsequent 4 hours, infuse 500 ml of 5% Dextrose surrounded by Normal Saline.?  
  • What is the difference between Mucinex and Mucinex maximum strength?
  • Do they sort little example pack for Ambien CR, that Doctors can pass to patients to try the drug confidently?
  • Does regaine minoxidil 5% go into bloodstreamm?