Keep note of these things before we start: -Of is a keyword that tells us multiplication is being done -x = total number of pages -32% = 32/100 = .32
Okay, here we go: 32% of total number of pages = 80 .32 of x = 80 .32*x = 80 .32x = 80 .32x/.32 = 80/.32 x = 250
There are 250 pages in total in Katie's book. To find out how many pages she has to read (y), subtract the pages read from the total: TOTAL - PAGES READ = PAGES LEFT TO READ 250 - 80 = y 170 = y