Question

Earth, Mars, Saturn, Uranus and Neptune revolve around the sun. Earth takes 1 year, Mars 2 years, Saturn 30 years, Uranus 84 years, and Neptune 165 years to make a complete revolution. How often will Saturn and Mars appear in the same direction in the night sky as seen from Earth? (Hint: Find the LCM of 30 and 2.) Saturn and Mars will appear in the same direction in the night sky every years.

Answer 1

30 years

Explanation:

2 is a factor of 30, so the LCM of 2 and 30 is 30.

Saturn and Mars will appear in the same direction in the night sky every 30 years.