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# A lending library has a fixed charge for the first three days and an additional charge for each day thereafter. Arushi paid Rs.27 for a book kept for seven days. If fixed charges are Rs.$x$ and per day charges are Rs.$y$. Write the linear equation representing the above information.  Answer Verified
Hint- Sum of fixed charges and additional charges of library is Rs.27

Given data:
Fixed charge is $x$Rs. for the first three days.
And after that per day charges are$y$Rs.
But Arushi kept the book for 7 days.
So, remaining day’s ${\text{ = 7 - 3 = 4}}$days.
$\therefore$ Additional charges $=$($4 \times$(Price for per day charge))
It is given that Arushi paid Rs. 27 for the book
Now according to given condition
Fixed charges $+$ additional charges $=$Rs.27
$\therefore$Fixed charges$+$ ($4 \times$(Price for per day charge))$= 27$
$\Rightarrow x + 4y = 27$
So, this is the required linear equation.

Note- Whenever we face such types of questions first find out the remaining days for which additional charges are applied , then according to the given condition which is written above formulate the linear equation, we will get the required linear equation representing the above information.
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