Multiple choice

Given that the lowest common multiple of 9 and 5 is added to the greatest common factor of 77 and 33. It gives us the number x. What is the 3rd multiple of x?

  1. 178

  2. 168

  3. 158

  4. 148

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

Multiples of 9 = 9, 18, 27, 36, 45 Multiples of 5 = 5, 10, 15, 20, 25, 30, 35, 40, 45 Least common multiple = 45 Factors of 77 = 1, 7, 11, 77 Factors of 33 = 1, 3, 11, 33 Greatest common factor = 11 11 + 45 = 56 56 × 3 = 168