unit rate of 13 miles per gallon?

Question

Which rate is equivalent to the unit rate of 13 miles per gallon?

twenty-six miles over two gallons
two gallons over twenty-six miles
thirty-nine miles over four gallons
four gallons over thirty-nine miles

Answer 1

Any number may be multiplied by the Multiplicative Identity (that is, 1) and it will remain the same [but units may change),

 

This problem gives a unit rate of 13 miles/gallon.

        (13 miles) / (1 gallon)

       ((13 miles) / (1 gallon)) * 1

       ((13 miles) / (1 gallon))*(2/2)

        (26 miles) / (2 gallons)

        26  miles per 2 gallons

Answer 2

13/1 = 4/39

 

1(4) = 13(39)

 

4 = 507

 

Nope.