Question

Rosa has read 72 pages of a book. These pages make up 45% of the book.

There are a total of BLANK pages in the book.

A. 72
B. 117
C. 160
D. 170

Please Help!

Answer 1

45% of x=72
x=72*100/45
x=160

there are 160 pages

Answer 2

The value of 45% is 72
45% = 72
the value of 1 % is 
1 %= 72/45
and the value of total number of pages ( 100% ) 
100 % = 72/45 * 100= 160 
and the blanked pages 
160 - 72 = 88