8 and 15 have no common factor so 8/15 cannot be reduced.
Something
Eight and eight are not fifteen. Eight and eight are sixteen.
It's (8/15) x 100 %
Eight over fifteen is. If you could get used to calling those fractions "seven fifteenths" and "one fifteenth", then you'd quickly realize that 7 of anything plus 1 of the same thing is 8 of them.
5/4
5 8/15 = 83/15
Seventy-eight thousand, two hundred fifteen.
Neither is correct. The nearest correct statement that can be constructed from anything close to the given materials is: "Eight and eight are sixteen."
The number "815" is expressed in words as "eight-hundred fifteen" or "eight-hundred and fifteen".
5/9 is greater than 8/15
the multiple of fifteen is 120 = 8x15=120
Eight hundred fifteen million, thirty-six thousand.