Maths-
General
Easy

Question

A fort had enough food for 80 soldiers for 60 days. How long would the food last if 20 more soldiers join after 15 days?

Hint:

Hint:
In a proportional relationship, the variables are related by a constant ratio(k). For example, the equation which can relate the two variables can be written in the form:
y = (constant) cross timesx or y = k cross times x.
So, for solving these types of questions we need to create a proportional relationship between the variables. These relationships can be direct, inverse etc.

The correct answer is: 15 days.


    Let the number of days be represented as x and the number of soldiers be represented as y. The number of days will decrease if the number of soldiers are increased so we can conclude that y is in inverse relationship with x. Let’s say the proportional relationship is given as
    y = k over x ……..(1)
    Step 1 of 2:
    After 15 days, the food is sufficient for 80 soldiers for (60 – 15) days = 45 days. So,  x = 45 and y = 80. Putting the values in equation (1)
    80 = k over 45
    k = 80 cross times 45  = 3600
    Step 2 of 2:
    Now we are asked to find the number of days the food will last if 20 more soldiers will join after 15 days. So, the total number of students becomes 100. Let the number of days be “d”. So, x = d and y = 100. Putting the values in equation (1)
    100 = k over d
    Now, put the value of k = 3600
    d = 3600 over 100
    d = 36 days
    Final Answer:
    Hence, the food will last for 36 days if 20 more soldiers join after 15 days.

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