Question

Lara reads $21$ pages of a book everyday and finishes the book in $30days$. If she reads $18$ pages in a day, in how many days will she finish the book $?$

Answer 1

Find the number of days:

Lara reads $21$ pages of a book in $30days$

No of days Lara takes if she reads $1$ pages of a book every day $=30\times 21=630days$ (less pages, more time will required)

Lara reads $18$ pages of a book in $\frac{630}{18}=35days$ (more pages, less time will required)

Hence, in $35days$ she will finish the book.