What is the least common multiple of 20,15,30?

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

Jose bought 20 shares of netflix at the close price of $117.98. in a few years, jose sells all of his shares at $128.34. how much money did jose make? a.) $192.50 b.) $207.20 c.) $212.50 d.) $224.60

Can someone me do math because i am having a breakdown rn because i don’t get it