There is an 18 inch sandwhich that Jenny cuts and gives half of the sandwhich to Demi and Joel gets 3/4 of what jenny has. Add all up to 18
Assuming you want the length of each piece,
1/2 = 9"
3/4 of that is 6 3/4 "
The rest is thus 2 1/4 "
1/2 = 9"
3/4 of that is 6 3/4 "
The rest is thus 2 1/4 "