Question

A printer can print 40 pages in 1.6 minutes

Answer 1

Given:
40 pages in 1.6 minutes

40 / 1.6 = 25 pages per minute

25 x 5 minutes = 125 pages

40 / 1.6 = x / 5
40*5 = 1.6x
200 = 1.6x
200/1.6 = x 
125 = x  pages

25 : 1 = 150 : x
25x = 150
x = 150/25
x = 6 minutes