If the cost of printing a book of 380 pages with 20 lines on each page and on an average 11 words in each line is Rs.19, then the cost of printing a book with 280 pages 22 lines on each page and 10 words in each line is
Rs. 14
PagesLinesWordsCost3802011192802210x
The total cost can be taken for the total number of words
Total number of words = No of pages × no of lines × No of words
W1=380×20×11
W2=280×22×10
Total number of words (W) is directly proportional to the total cost
W1W2=C1C2
⇒380×20×11280×22×10=19x
⇒1914=19x
⇒x=14.
Hence, the cost of printing a book with 280 pages 22 lines on each page and 10 words in each line is Rs 14