Question

A machine can collate 126 400 page books in 14 days. if it continues to collate at this same rate, how many 400 page books could it collate in 30 days

Answer 1

For this case we can make the following rule of three to solve the problem:
 126 --------> 14
 x -----------> 30
 We clear the value of x:
 x = (30/14) * (126)
 x = 270 400 page books
 Answer:
 it could collate in 30 days about:
 x = 270 400 page books