Book Maths Puzzle Percentage

What is the number of degrees in the central angle of a sector that makes up 42% of a pie chart?

Read Solution (Total 1)

100% of pie chart makes angle at center= 2*pi
42% of pie chart makes angle at center= (2*pi*42)/100=151.2(in degree)
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Book Other Question

Find two consecutive even integers such that the square of the second, decreased by twice the first, is 52. At a certain school, 240 of the students take math, 180 of the students take grammar, and 100 of the students take both. If every student must study either math or grammar, how many students attend this school?