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Question

50 men lived in a castle and had food for 50 days but 20 men left in between after fortnight .So, tell how many men can survive for how many days with the left food ?

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Solution

Dear student
Let x be the amount of food taken by each men per day and the total amountof food available in the castle be M.So, when 50 men are there, the food lasts for 50 days,therefore50x×50=M ...(1)Now till 14 days all the men take food but after that 20 men left the castle.Let the no.of days the food will last be d.So,50x×14+30x×d=M50x×14+30x×d=50x×50700+30d=250030d=1800d=60Therefore, after 15 days when 20 men left the castle, the food will last for 60 days
Regards

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