Rewrite each mixed number so that the whole number part is less by 1

5. 4 1/2
7. 1 9/10
, it's confusing.

Iam so stuck. what is the worked out answer for this question?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document