Question

a Java book is compromise of two sections of core and advanced java in the ratio 7:2. how much of each type of content will be needed to make a book of 450 pages?

Answer 1

Let  the common factor = x
then  core section has 7x pages
and advance section 2x pages

Total pages = 450
7x+2x=450
9x=450
x=450/9
x = 50

Core section =  7x =7*50 = 350 pages
Advance Java section = 2x = 2*50 =100 pages

Answer 2

let first part be 7x and second part be 2x
Then no of pages in first part=7/9*450=350
no of pages in second part=
2/9*450=100