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Q.

In a hostel of 50 girls, there are food provisions for 40 days. If 30 more girls join the hostel, ____ days long will these provisions last.

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Detailed Solution

Concept- The provisions will last upto 25 days. Set up the ratio and proportion and solve according to the known and unknown ratios. Take any variable as the reference number when available and shape the word assertions into the form of mathematical expressions in these ratio and percentage questions.
If

be the number of days with food provisions for

. e. . , 50 + 30) girls
Question Image

Question Image

As no. of girls and no. days with food supplies are inversely correlated. So, we get

=25
Hence, the correct answer is 25 .

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In a hostel of 50 girls, there are food provisions for 40 days. If 30 more girls join the hostel, ____ days long will these provisions last.