Question

in a village 20% of tobacco chewers have oral cancer .80% of people having oral cancers are tobacco chewers.if 30% of population chew tobacco ,what is the percentage of population having oral cancer?
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Answer 1

Answer:

The answer is 7.5%

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Answer 2

• Let the total population be x.
• Total number of tobacco chewers = 30% of population

                                       =0.3x

• Total number of tobacco chewers having oral cancer =20% of (0.3x)

                                                                                                  =.06x

80% of oral cancers are tobacco chewers = 0.06x

⇒80% of oral cancers=0.06x

⇒4/5(Number of people with oral cancer)=0.06x

⇒Number of people with oral cancer=0.06x(5/4)

                                                             =.075x

∴Percentage of population having oral cancer=(.075x/x)100

                                                                             =7.5%

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