Omar owns a sandwich shop, and his best selling sandwich is the BLT. When making BLT sandwiches, it takes of a pound of bacon to make 4 sandwiches. He uses pounds of bacon for every 2 tomatoes used and 5 tomatoes for every full head of lettuce used.

If Omar is making enough BLT sandwiches to use 2 full heads of lettuce, then he is going to use _______
pounds of bacon and will make a total of ________
BLT sandwiches.

To make enough sandwiches to use 2 full heads of lettuce, Omar will need 5 tomatoes for each head of lettuce, so he will need 5*2=<<5*2=10>>10 tomatoes.

For 4 sandwiches, it takes 1/4 pound of bacon for each sandwich, so for 10 sandwiches worth of bacon, Omar will need 1/4*10=2.5 pounds of bacon.
For every 2 tomatoes, Omar needs pounds of bacon, so for 10 tomatoes, Omar will need 2.5/2=<<2.5/2=1.25>>1.25 pounds of bacon.
Therefore, Omar will use 1.25 pounds of bacon and he will make a total of 10 sandwiches. Answer: \boxed{1.25 \text{ pounds}, 10 \text{ sandwiches}}.