Question

For every six days that Ahmad works, he gets a day off. For every
seven days that Xinyi works, she gets a day off. Ahmad and Xinyi
have the same day off on the 10th of March. When do they next
have the same day off?​

Answer 1

Answer:

Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium point. The word comes from Latin vibrationem. The oscillations may be periodic, such as the motion of a pendulum—or random, such as the movement of a tire on a gravel road.