Level 3
Risa was given a piece of lace of length 6 m 30 cm. She used a part of it to tie 5 curtains and 2 m 20 cm of the remaining length to decorate her room. Given that each curtain needed 50 cm, what was the length of the lace that was left behind by Risa? (Leave the answer in metres and centimetres.)
Level 3
Keith paints 65 cm of the wall daily. After 5 weeks, 8 m of the wall was still unpainted. What is the length of the wall? Give the answer in metres and centimetres.
Level 3
At sunrise an ant began jumping up a 2-metre sand hill. Every hour, it was able to climb up 40 cm, but then slid back 30 cm due to the loose sand. How long did it take the ant to reach the top?