8th Class Mathematics Related to Competitive Exam Question Bank Arithmetic

  • question_answer
    A fort is provisioned for 42 days, after 10 days a reinforcement of 200 men arrives and the food will now last 24 days. How many men were there in the fort?

    A) 300 men               

    B) 400 men

    C) 500 men               

    D) 600 men

    Correct Answer: D

    Solution :

    Day                        Men \[{{V}_{0}}\]                   x \[{{V}_{n}}\]                               \[{{V}_{n}}={{V}_{0}}{{\left( 1-\frac{R}{100} \right)}^{n}}.\] Above problem is of inverse variation. So \[{{V}_{0}}\] \[{{R}_{1}}%\] \[{{n}_{1}}\]


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