Multiple choice

A number x is obtained when the least common multiple of 6, 18 and 27 takes away the 5th multiple of 7. How many factors does x have?

  1. 5

  2. 4

  3. 3

  4. 2

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Multiples of 6 = 6, 12, 18, 24, 30, 36, 42, 48, 54 Multiples of 18 = 18, 36, 54 Multiples of 27 = 27, 54 Least common multiple = 54 Fifth multiple of 5 = 7 × 5 = 35 54 - 35 = 19 so, 19 has 2 factors.