the equation is this
5/6 = X/24
to be equal the numerator of both sides have to be the same and so does the denominator, so if the what number can you multiply 5/6 to get something / 24
5 * (4) / 6 * (4) = X/24
20/24= X/24
and then its simple from there :)
hope this helps! good luck and feel free to message me for further help