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find the mising term N following the steps.
1. 2:5=N:10
2. 10:N=5:6
3. 2:4=6:N
4. if a 1000-cm string is cut into the ratio of 1:N:2,what is N?
5. if a 20-m bamboo is divided into the ratio of 2:N:5 what is N?​