Machine S and Machine T were both cleaned this week. Machine S is cleaned every 4 weeks. Machine T is clean every 10 weeks. What is the fewest number of weeks that will be passed before both machines are clean I’ll get in the same week

i'm assuming that the correct answer is indeed the first one/ "a"..

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but