Question

One-fifth of "r" is 15

Answer 1

One-fifth of r is 15 is translated to, 1/5r = 15

The word "of" means multiply and the word "is" means equal

And if you're looking for "r" then follow these steps⬇️
1/5 (5/1) ⬅️ cancel out this
15 (5/1) = 75
R = 75

Good luck on your assignment

Answer 2

1/5r = 15

(5)1/5r = 15(5) 

r = 75