Bonjour
G = 15/16 : 10
G = 15/16 x 1/10
G = 15/160
G = (5 x 3) / (5 x 32)
G = 3/32
H = 21/15 : 8
H = 21/15 x 1/8
H = 21/120
H = (3 x 7) / (3 x 40)
H = 7/40.