Question 844829
jess=x
jon =y
5+4=9 for jess 4 for jon

9/x+4/y=1,
1+7=8 for jess and 7 for jon

8/x+7/y=1

x = 31/3,   y = 31
check
9/(31/3)+4/31=1
27/31+4/31=1
31/31=1
8/(31/3) +7/31=1
24/31+7/31=1
31/31=1
ok