A) 1200
B) 360
C) 120
D) 240
Correct Answer: D
Solution :
Let the total number of pages in the book be x. So, \[90+(x-90)\times \frac{4}{5}+\frac{1}{8}\times x=x\] \[90+\frac{4x}{5}-72+\frac{x}{8}=x\] \[90-72=x-\frac{4x}{5}-\frac{x}{8}\] \[18=\frac{40x-32x-5x}{40}\,\,\,\Rightarrow \,\,3x=18\times 40\] \[x=240\] \[\therefore \] Total number of pages in a book \[=\underline{\mathbf{240}}\]You need to login to perform this action.
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