Allowances 82413

The teacher decided to sew covers for the eight-seat blocks in the school library. All cubes are cube-shaped with an edge 40 cm long. How many m2 of fabric will the teacher need in total if the blocks are not lined from the bottom, and 5% must be added for seam allowances?

Correct answer:

S =  7 m2

Step-by-step explanation:

n=8 s=61=5 a=40 cm m=40:100  m=0.4 m r=100%+5%=1+1005=1.05  S1=s a2=5 0.42=54=0.8 m2 S2=n S1=8 0.8=532=6.4  S=S2=6.4=7 m2



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