a)5/2:5/7=5/2*7/5=7/2
b)5/11:13/5=5/11*5/13=25/143
c)36/7:24/14=36/7*14/24=6/2=3/1=3
d)52/27:13/9=52/27*9/13=4/3
e)78/25:26/5=78/25*5/26=3/5
f)5 1/4:21/2=21/4*2/21=1/2
g)11 2/3:36/5=35/3*5/36=175/108
h)42/5:42/5=42/5*5/42=1
l)92/9:92/8=92/9*8/92=8/9
J)62/3:60/4=62/3*4/60=124/90=62/45