For a 20% decrease in the radius of a circle, what will be the percentage reduction in its area?

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A number when multiplied by 13 is increased by 180. The number is ----

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853+? /17=1000

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3.5 can be expressed in terms of percentage as ----

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In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B, the present age of B is ----

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