book Maths Puzzle Numerical Ability

The ratio of the lengths of corresponding sides of two similar polygons is 3:7. What is the ratio of their areas?

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Goodevening, could u help me again for these problems, but i try i am not sure a bout its answer.. please help me.

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Bank credit During a sale,the price of a book is reduced by 25%. The sale price is then further reduced by 40%. The cost of the book as a percentage of the original price is?