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Quantity proportional to number times days (men, cows): find the missing one

This type of question, asked 2 times: CDS 2 2017, CDS 1 2019. All 2 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    CDS 2 2017

    26
    To maintain 8 cows for 60 days, a milkman has to spend Rs. 6,400. To maintain 5 cows for nn days, he has to spend Rs. 4,800. What is the value of nn ?

    Tap an option to check your answer.

  2. Question 2

    CDS 1 2019

    25
    A stock of food grains is enough for 240 men for 48 days. How long will the same stock last for 160 men ?

    Tap an option to check your answer.