5/6 * 3/3 = 15/18......if u take ur fraction and multiply it by the same numerator and denominator, the result will be an equivalent fraction.
example :
if I multiplied 5/6 * 2/2 = 10/12...this is also equivalent...
5/6 * 4/4 = 20/24....and this is equivalent as well.
so ur answer is 15/18