Respuesta :

15/40 (3/8) 28/40 (7/10)
8 and 10 can go into 40.  1st fraction:  3 times 5 is 15 and 8 times 5 is 40 - answer is 15/40.  2nd fraction:  7 times 4 is 28 and 10 times 4 is 40- answer is 28/40