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Mangala started doing physical exercise 10 minutes for the first day. She will increase the time of exercise by 5 minutes per day, till she reaches 45 minutes per day. How many days are required to reach 45 minutes?

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The daily time of exercise is an A.P. with the first term 10 and common difference 5.

\(\therefore\) The number of days required to reach 45 minutes will be 8.

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