Math 115 12
posted by Deb .
Find the reciprocal of (1/7) (21)

The product of those numbers is 3, and the reciprocal of that is 1/3.
You could also compute it as the product of the reciprocals, (7)x(1/21) 
sorry i don't understand

The reciprocal of a whole number is "one over" the number, expressed as a fraction. For example, the reciprocal of 2 is 1/2.
The reciprocal of a fraction is the same fraction, upside down. For example, the reciprocal of 2/3 is 3/2. Now do you understand? 
This site may help you understand reciprocals.
(Broken Link Removed) 
so my answer is:
7/1 and 1/21 correct