Multiple choice

What is the result obtained when greatest common factor of 80 and 90 is added to least common multiple of 5 and 11?

  1. 42

  2. 48

  3. 50

  4. 65
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Factors of 90 = 1, 2, 3, 5, 6, 9, 10,15, 30, 90 Factor of 80 = 1, 2, 4, 5, 8, 10, 20, 40, 80 Greatest common factor = 10 Multiples of 11 = 11, 22, 33, 44, 55, .. Multiples of 5 = 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, ... Least common multiple = 55 55 + 10 = 65

Keep practicing — related questions