### Video Transcript

The pie chart shows the results of
a survey to find the most popular subject in a school. What percentage of students picked
mathematics?

We know that the sum of all
percentages in a pie chart is 100. This means that we can begin by
adding the percentages we know: 26, 19, 16, and 15. This is equal to 76. So 76 percent of the students did
not pick mathematics. In order to calculate the
percentage that did, we need to subtract this number from 100. 100 minus 76 is equal to 24.

We can therefore conclude that 24
percent of the students picked mathematics. We know that this answer is a
sensible one, as the sector for mathematics looks approximately one-quarter of the
circle, and one-quarter is equal to 25 percent.