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Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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average problems

by R.K » Thu May 31, 2012 9:43 am
A man bought 27 horses at Rs.280 each 9 horses at Rs.320 each and 6 horses at Rs.360 each. find the average price per horse?
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by Jim@StratusPrep » Thu May 31, 2012 10:31 am
Going to do 2 things to make the math more simple. First, divide the horses by 3. You are left with 9, 3 and 2 horses.

Then subtract the 280 from all prices. ( we will add it later)

(9(0) + 3(40) + 2(80))/14

120+160)/14

280/14 = 20

20 + 280 = 300
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