51 is the product of Rhonda's age and 3.
3R = 51
To find Rhonda's age, we need to divide the given number (51) by the given constant (3).
Rhonda's age = 51 ÷ 3
To perform the division, we simply divide 51 by 3:
Rhonda's age = 17.
Therefore, Rhonda is 17 years old.