Question

A ribbon is 3metres long. I need 8pieces of ribbon each 40cm long. how many centimetres shorter is the ribbon than the length I need?

Answer 1

1m=100cm
3m=300cm
300/40=7.5
7.5-8=0.5
0.5*40=20
20 m more needed

Answer 2

Hey!!!
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●3m=300cm
And 40cm×8=320cm
So,Ribbon is shorter by 20cm for 8 ribbons.
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Hope it helps!!! :)