(Answered) Please solve using separation of variables methoda certain

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Please solve using separation of variables method.

A certain chemical is converted into another chemical by a chemical reaction. The rate at which the first chemical is converted is proportional to the amount of this chemical present at any instant. Ten percent of the original amount of the first chemical has been converted in 5min.

a) What percent of the first chemical will have been converted in 20min?

b) In how many minutes will 60% of the first chemical have been converted?

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