The following pie chart shows the hourly distribution in a day (in degrees) of all the major activities of a student. Moreover, a day has 24 hours.
If he spends the time in games equal to the home work and remains constant in other activities, then the percentage decrease in time of sleeping:
The time spent in playing games and in doing homework corresponds to 30° and 45° respectively.
If the time spent in playing games is equal to that spent on doing homework, then there should be an increase of 15° in the time spent in games.
If this 15 ° is obtained by decreasing the time spent in sleeping (with the other activities remaining constant),
The percentage decrease in the time spent in sleeping = $$\ \frac{\ 15^0}{120^0}\times\ 100$$
= $$12.5^0$$
B is the correct answer.
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