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This answer is incorrect.

In a chart like this all the percentage must add up to 100%. Therefore all you need to do is to add up all the percentages that are given and subtract that total from 100%

25% + 4 % + 8% + 33% + 17% = 87%

100% - 87% = 13%

Now let us try another one

Mr. Smith the principal of the High School decided to see how he spent his time everyday, so he made the chart you see below. Now how much time does Mr. Smith spend with his children everyday.

Pie Chart divided into six sections: Sleeping twenty percent, Working thirty percent, Playing With His Children, Eating four percent, Watching TV twelve percent, and Driving to and From Work twelve percent.

 

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