You're right about the vulgar fraction teram - I replied below you, but got to another answer and pointed out how to do it.
It came down to 21 over 45, which is divisible again . The greatest common divisor is 3, so the answer is 7 15ths - I'm pretty sure of it. x
Tis a long time since my school days so my answer is not reliable. Y did I need to have such rubbish dinned into me that I've never needed to use, till now!
Worse, I recall the maths teacher hitting me on the head with ruler edge but can't remember a fax number I was given an hour ago.