Job Problem 仕事算😸

　以下、仕事算について英語で問題と解答例を書いてみる。英語に磨きをかけたい方は、挑戦してはいかがだろうか？😸

Question: There is a job that takes 20 days to do alone by Taro or 30 days to do alone by Hanako. On this job, at first Taro works by himself for 5 days and after that Taro and hanako work together and finish the job. All together, how many days does it take to complete the job?

How to solve:  Taro finishes 1/20 of the whole job in 1 day. If Taro works for 5 days, he finishes 1/4 of the job. Hanako finishes 1/30 of the whole job in 1 day. If Taro and Hanako work together, they finish 1/12 of the whole job. The job left over is 3/4 of the job therefore the number of days they work together is 9 days. So, the number of days it takes to finish the job is, 14 days. 

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