Question
Mary was given a piece of ribbon of length 10 m 10 cm. She used a part of it to tie 7 curtains and 1 m 40 cm of the remaining length to decorate her room. Given that each curtain needed 60 cm, what was the length of the ribbon that was left behind by Mary? (Leave the answer in metres and centimetres.)
4 m

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Mary was given a piece of ribbon of length 10 m 10 cm. She used a part of it to tie 7 curtains and 1 m 40 cm of the remaining length to decorate her room. Given that each curtain needed 60 cm, what was the length of the ribbon that was left behind by Mary? (Leave the answer in metres and centimetres.)