Do the ratios 19 /20 and 6/ 15 form a proportion?

)a smart phone has dimensions of 4.9 inches (height), 2.3 inches (width) and 8.0 millimeters (depth). what is the volume of the smart phone in cubic centimeters? (1 in = 2.54 cm)

We have 339 ounces of jam to be divided up equally for 12 people how muny ounces will each person get

What unit of been sure would be appropriate for the volume of a sphere with a radius of 2 meters