<PRE><B>Question 343395</B>
Let t = tacos


3/t = 1.17/15.21


1.17t = 3(15.21)


1.17t = 45.63


t = 45.63/1.17


t = 39


You can buy 39 tacos.

NOTE: This is a typical proportion word problem.  You will see tons of them in 


math courses and math books.  So, learn to identify them at first glance.


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