Question 337042
A carpenter has three large boxes. Inside each
large box are two medium-sized boxes. Inside each
medium-sized box are five small boxes. How many
boxes are there altogether?


lb = large box, mb = medium box, sb = small box


lb --> mb --> 5 sb
   --> mb --> 5 sb
lb --> mb --> 5 sb
   --> mb --> 5 sb
lb --> mb --> 5 sb
   --> mb --> 5 sb
3 lb, 6 mb, 30 sb --> 39 boxes total