4 ice cream cones cost $6. At this rate, how much do 7 ice cream cones cost?
2 answers:
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From the 3 options listed, both 
in and 
in could be measures found using a ruler with eighth inches marked, because those decimals can be written in terms of eighth fractions.
The other option,
in, is not a possibility because 0.1 cannot be written as a fraction of 8 that is marked on the ruler.
The other option,