According to the problem's info, we have:
(1 + 2 + 4)pieces of fabric = 1bug
(7)pieces of fabric = 1bug
so we know for each bug Missy uses 7 pieces of fabric (of different shapes).
Then, if she uses 70 pieces (710) of fabric, those are 10 bugs(110) built.
so we have to multiply by 10 the amount of pieces used in one bug:
hexagonal = 110 = 10
rectangular = 210 = 20
triangular = 4*10 = 40
which give us 70 pieces total.
