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You and your friend get the same magazine. You spend $15 for twelve issues. Your friend pays $1.50 per issue but gets the first two issues free. How many issues will your friend get if he also spends $15?

Answer :

(1.5 / 15) + 2  = 12 
you add two because he gets two for free 
dived 1.5 by 15 because that will give you how many magazines you can get for $15 

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