The result of a fraction is different?

[TheUninvited]

so we have this fraction shown in the picture, the result must be 1/3 but it is not as the website that set that questions gives a totally different answer.

i don't really get it what's the correct answer for this fraction?

 

[tkhunny]

What don't you get? 1/3 (or 5/15) is correct. Where did the very bad 4/5 come from?

 

[TheUninvited]

What don't you get? 1/3 (or 5/15) is correct. Where did the very bad 4/5 come from?

the application my maths gave the result as 4/5 i dont know why thought.

 

[tkhunny]

Feel free to disagree with given answers, but prove it before you take your show on the road.

 

[JeffM]

I suspect the site has a typographical error, and the problem intended is

[MATH]\dfrac{18}{15} - \dfrac{2}{5} = \dfrac{4}{5}[/MATH].