Question

Bale read 60% of total number of pages in a book. The next day he read 80% of the remaining pages. If 40 pages of the book are yet to be read by him , find the total number of pages in the book.

Answer 1

Answer:

500 pages

Step-by-step explanation:

Let the number of pages be x. Then,

60% of Total Pages = x * 0.6

Remaining Pages for next day= x - 0.6x = 0.4x

80% of 0.4x = 0.4*0.8*x =  0.32x

Therefore x = 0.6x + 0.32x + 40

0.92x + 40 = x          [remaining pages are 40]

40=0.08x

x= 40/0.08

x = 500

Therefore book consist of 500 pages.

Answer 2

Step-by-step explanation:

Let total number of pages be x.

Book read today = 60% of x

Book read next day = 80% of 40% of x

= 32% of x

Pages remaining = 100% - 60% - 32% of x

= 8% of x

But remaining pages = 40

Therefore,

8% of x = 40

8/100 × x = 40

x = 4000/8

= 500

Book has 500 pages.