Question

whats the answer for this question. A java book is comprised of two sections core and advanced java in the ratio 7:2 how much of each type of content will be needed to make a book of 459

Answer 1

Let the core section= 7a and the advanced java section=2a
So, 7a+2a=459
9a=459
a=51
Therefore,
Core section should have=7*51=357
Advanced java section should have=2*51=102

Answer 2

let the core section be 7x
so the java section = 2x
according to the question
7x+2x=459
9x=459
x=459/9=51
so number of pages containind core section= 7x=7*51=357
number of pages containing java = 2x =2*51=102