Question

The ratios of price of two books is 5 : 7. If the price of second book is ₹63, find the
price of 1st book.
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Answer 1

$7x=63×5 \\ </p><p>x=315/7 \\ </p><p>x=45$

Answer 2

Answer:

price of first book  = ₹45

Step-by-step explanation:

ratio of price of 2 books is 5:7

let x be the proportionality constant

=> price 1st book = 5x

and price of 2nd book = 7x = ₹63  (given)

 => x = ₹63/7

         = 9

ie., price of first book = 5(9) = ₹45