Step-by-step explanation:
Option 1 and 4 are correct for sure
Do you have a photo, what tells us that the unknown number is multiplied by 3?
For number 1. it is wrong. It is fresh water. Ocean water is salt water. I don't know the rest, sorry. I will come back if I find out though! :D
Answer: 
Step-by-step explanation:
Given
Rami practices his saxophone for
hour on 4 day each week
So, for a week she practices around

Converting it into mixed fraction
