Difference John and Bobby joined a company at the same time . They both worked very hard . After several years , Bobby became the manager , but John thought it was unfair , so he gave his resignation  to the boss . When the boss found out the reason why John wanted to leave , he said , "I hope you will do one more thing for our company before you leave . " John agreed . The boss asked him to find out if anyone was selling watermelons at the market . John went and soon returned . He said he had found a man selling watermelons . The boss asked him how much they were . John shook his head  and went back to the market . When he returned , he told the boss they were $ 1.2 per kg . Then the boss asked Bobby to find a watermelon seller at the market . Bobby went , returned and said , "Only one person is selling watermelons . $ 1.2 per kg , 340 melons in all , and each melon weighs about 2 kg . They are fresh . " John realized  the difference between himself and Bobby . He decided not to leave but to learn from Bobby. John and Bobby were    _   .
friends workmates classmates brothers