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Question

The percentage of world population of countries is given in the following table. Find the value of $$a$$. If a pie diagram has to be drawn, what would be the measure of the central angle from USA?
Country              India   China   Russia   USA   Others   Total
% of population  $$15$$       $$20$$        $$a$$        $$a$$             $$25$$          $$100$$


Solution

The % population of USA = total % population - rest. => 15+20+a+a+25=100;   60+2a=100;  a=20;  For central angle of USA=  (20/100)*360 = 72 degrees

Maths

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