The relationship between a measurement in units A and the same measurement in units B can be expressed by the equation , where is a constant. If 15 units of A are equivalent to 60 units of B, which of the following statements must be true?
1 unit of A is equal to 4 units of B.
1 unit of B is equal to 4 units of A.
The value of is .
To convert from units B to units A, multiply by 4.
