Mom goes to the store to buy fruit. She brings just enough money to buy 3kg of strawberries or 12kg of apples. After she buys 2kg of strawberries, the rest of the money is used to buy apples. How many kilograms of apples can she buy?
妈妈去商店买水果，她带的钱正好够买3千克草莓或12千克苹果，她买了2千克草莓后，余下的钱全部用来买苹果，还能买多少千克苹果．
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<result>4</result>