{"pre_text": ["underlying physical transaction occurs .", "we have not qualified commodity derivative instruments used in our osm or rm&t segments for hedge accounting .", "as a result , we recognize in net income all changes in the fair value of derivative instruments used in those operations .", "open commodity derivative positions as of december 31 , 2008 and sensitivity analysis at december 31 , 2008 , our e&p segment held open derivative contracts to mitigate the price risk on natural gas held in storage or purchased to be marketed with our own natural gas production in amounts that were in line with normal levels of activity .", "at december 31 , 2008 , we had no significant open derivative contracts related to our future sales of liquid hydrocarbons and natural gas and therefore remained substantially exposed to market prices of these commodities .", "the osm segment holds crude oil options which were purchased by western for a three year period ( january 2007 to december 2009 ) .", "the premiums for the purchased put options had been partially offset through the sale of call options for the same three-year period , resulting in a net premium liability .", "payment of the net premium liability is deferred until the settlement of the option contracts .", "as of december 31 , 2008 , the following put and call options were outstanding: ."], "post_text": ["in the first quarter of 2009 , we sold derivative instruments at an average exercise price of $ 50.50 which effectively offset the open put options for the remainder of 2009 .", "at december 31 , 2008 , the number of open derivative contracts held by our rm&t segment was lower than in previous periods .", "starting in the second quarter of 2008 , we decreased our use of derivatives to mitigate crude oil price risk between the time that domestic spot crude oil purchases are priced and when they are actually refined into salable petroleum products .", "instead , we are addressing this price risk through other means , including changes in contractual terms and crude oil acquisition practices .", "additionally , in previous periods , certain contracts in our rm&t segment for the purchase or sale of commodities were not qualified or designated as normal purchase or normal sales under generally accepted accounting principles and therefore were accounted for as derivative instruments .", "during the second quarter of 2008 , as we decreased our use of derivatives , we began to designate such contracts for the normal purchase and normal sale exclusion. ."], "table": [["option expiration date", "2009"], ["option contract volumes ( barrels per day ) :", ""], ["put options purchased", "20000"], ["call options sold", "15000"], ["average exercise price ( dollars per barrel ) :", ""], ["put options", "$ 50.50"], ["call options", "$ 90.50"]], "table_ori": [["Option Expiration Date", "2009"], ["Option Contract Volumes<i>(Barrels per day)</i>:", ""], ["Put options purchased", "20,000"], ["Call options sold", "15,000"], ["Average Exercise Price<i>(Dollars per barrel</i>):", ""], ["Put options", "$50.50"], ["Call options", "$90.50"]]}

Question: for option expiration dates in 2009 , what was the average option contract volumes ( barrels per day ) for put options purchased and \\ncall options sold?
Evidence:
table_2: option expiration date the put options purchased of 2009 is 20000 ;
table_3: option expiration date the call options sold of 2009 is 15000 ;
Program: add(20000, 15000), divide(#0, const_2)
Answer:
str_answer: 17500
exe_answer: 17500