Sorry, I didn't read the question fully. I don't know how to do this. Please disregard my previous answer.
Kinda confused of the question
5=(1)+(1)+(1)+(1)+(1)
=(1/3+1/3+1/3)+(1/3+1/3+1/3)+(1/3+1/3+1/3)+(1/3+1/3+1/3)+(1/3+1/3+1/3)
=3(1/3)+3(1/3)+3(1/3)+3(1/3)+3(1/3)
=15*(1/3)
There are <u>fifteen</u> thirds in five.