no
Do you mean five over three? If so that's 1.667.
YES
five over twelve is bigger than three over eight
1 7/12 (one and seven-twelfths)
14/15
the simplest form of four over five is....four over five. You can't reduce that fraction because it already is in simplest form.
The answer is three over five. It's original form is six over ten. (divide by two and you get three over five.)
5 over 55
-15
Divide both by four. The answer is five.
There is no meaningful question in "three over five y plus one over nine". There cannot, therefore, be an answer.
12.