Answer: Width of box is not taken up by pencils = 
Width of each pencil 
Step-by-step explanation:
Given: Width of pencil box = 
Width of seven pencils = 
Width of box is not taken up by pencils = Width of pencil box - Width of seven pencils

Width of box is not taken up by pencils = 
Width of each pencil = (Width of seven pencils ) ÷ 7

Width of each pencil 
If I understand your question correctly then it's simple all you have to do is use the numbers in the place of the b and c so the question would be what is 8-7 which equals 1
Answer:
820
Step-by-step explanation:
100j+40h
100(5)+40(8)
500+320
820!