Reemu read \(\dfrac{1}{5}\)th pages of a book. If she reads further 40 pages, she would have read \(\dfrac{7}{10}\)th pages of the book. How many pages are left to be read?
24 pages
Let total pages be \(T\). Then \(\dfrac{T}{5}+40=\dfrac{7T}{10}\Rightarrow 40=\dfrac{T}{2}\Rightarrow T=80\). Read = \(\dfrac{7}{10}\times 80=56\). Left = \(80-56=24\).