Question

Answer the question in the image

Answer 1

Answer: The percentage of decrease is: " 33 ⅓ %" .
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Step-by-step explanation:
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Given:
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10 years ago, # of illiterate people = 150 lakhs;

"Now" ; # of illiterate people = 100 lakhs ;
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So; the decrease in the # of illiterate people = "(150 - 100) = 50 lakhs ;
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To calculate the "percentage of decrease" :
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The "percentage of decrease" =

{"decrease in the # of illiterate people"} / {"# of illiterate people started with"] ;

× 100 (percent).
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=
`(50)/(150)` * 100 % ;

{Note that:
`(50)/(150)` =
`(5)/(15)` ;
→ The "zeros" cancel out ;

→
`(50)/(150)` * 100 % ;

=
`(5)/(15)` * 100 ;

Note:
`(5)/(15)` =
`((5/5))/((15/5))` ;
=
`(1)/(3)` ;
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→
`(1)/(3)` * 100 =
`(1)/(3)` *
`(100)/(1)` ;
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=
`((1*100))/((3*1))` % ;

=
`((100))/((3))` % ;

= "(100 ÷ 3) % ;

= " 33 ⅓ % " .
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Answer: The percentage of decrease is: " 33 ⅓ %" .
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