AskQ logo

STUCK ON HOMEWORK?

ASK FOR HELP FROM OUR KIASUPARENTS.COM COMMUNITY!

Question

Answer

post-18136

42 metal strips will make 21 of the designs, since he needs 2 metal strip to make one design.

Length wise,
1st piece is 11cm in length and subsequent 20 pieces adds 3 cm each to the length.
1st piece + 20 X 3 = 11 + 60 = 71 cm

Breadth wise,
1st pieces contributes 8cm, and subsequent 20 pieces adds 3 cm each to the breadth.
1st pieces + 20 X3 = 8 + 60 = 68 cm

a) area of board = 71 X 68 = 4828 cm2 ###

b) Area of one design = 8 X 3 X 2= 48 cm2
Total area of design = 48 X 21 = 1008 cm2

% not covered = (4828 – 1008)/ 4828 X 100 = 79%, round off to nearest whole number. ###

0 Replies 2 Likes