Step-by-step explanation: You know that it is a prime if the only number divisible by the number is one. If there are more numbers than 1 then it is composite.
I’m not *completely* sure if this would be right, but it could possibly be: 160 how i got this: 20 = 150 /(divide) 150 0.13(recurring) = 1 x1200 160 = 1200
if you need me to explain anything in detail, please feel free to message! have a nice day:)<3