Question

a book contains 320 pages Vishal read 3 upon 5 of the book how many pages are left to be read

Answer 1

320×3/5=192
192 pages are left to be read

Answer 2

Total pages=320

$Vishal \: read \: pages= \frac{3}{5} \times 320 = 192 \: \\ pages \: are \: left \: to \:be \: read \: = 320 - 192 = 128$