Question

what is every fraction with a whole number denominator less than 50 that is equivalent to 10/15

Answer 1

If your asking for a same value fraction with a higher denominator, than 20/30, or 30/45

Answer 2

2/3
4/6
6/9
8/12
10/15
12/18
14/21
16/24
18/27
20/30
22/33
24/36
26/39
28/42
30/45
32/48

Plus the others with whole-number denominators, like

(2-2/3)/4,  (3-1/3)/5,  (4-2/3)/7,  (5-1/3)/8,  (6-2/3)/10,  (7-1/3)/11, etc.


And also there are all the ones like     

                             (-2,000) / (-3,000) . . . . . .  (-3000 is certainly less than 50)