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1. The following pie- chart shows the study- time of different subject of a student in a day. Study the pie chart and answer the following questions.

Instead of 10%, if the students spends 15% to study other subjects and the time is taken from the time scheduled to study mathematics and if he/she used to study 20 hours per day, then their difference of time for study mathematics per day is:
then difference in mathematics = 5%
∵ 100% = 20 hours
∴ 5% = 1 hours

Instead of 10%, if the students spends 15% to study other subjects and the time is taken from the time scheduled to study mathematics and if he/she used to study 20 hours per day, then their difference of time for study mathematics per day is:
Solution:
Extra time taken = 15% - 10% = 5%then difference in mathematics = 5%
∵ 100% = 20 hours
∴ 5% = 1 hours