Hi,
Answer: 3/5
My work: To easily solve and simplify this fraction you would have divide both numbers by 9. You would divide by 9 because this is the number that the two numbers 27 and 45 can come come together and divide evenly. Perferbably with a caculator divide 27/45 with 9 (27\45 / 9) and your get your answer 3/5.
I Hope I helped!