Answer: 1/5
Step-by-step explanation: To divide a fraction by a whole number, it may help to think of 3 as 3/1.
Since dividing by a fraction is the same thing as multiplying
by the reciprocal of the fraction, we can rewrite 3/5 ÷ 3 as 3/5 · 1/3.
Multiplying across the numerators and denominators gives us 3/15
which can be written in lowest terms as 1/5.