Question

A book distributor is trying to divide an order of textbooks into equally sized groups for shipping in cartons. The textbooks can be divided into groups of 12, groups of 15, or groups of 18, with no books left over. Which of the following inequalities is satisfied if N is the smallest possible total number of textbooks?
A. 100 < N < 150
B. 150 < N < 200
C. 200 < N < 250
D. 250 < N < 300

Answer 1

Calculate least common factor of 12, 15 & 18.
It will be 180.
answer is 
B. 150 < N < 200