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Answer:
2nd one
1 min=3.33 snaps
21×3.33=69.93
21mins =69.93 snaps
3rd one
1/2=0.5
1/8 of a minute=7.5 seconds
7.5×16=120
120 cookies in 16 minutes
4th one
3/4=0.75
5/6×60=50
50mins to bake 0.75 of a cake
so 0.75×18=13.5
13.5hrs to bake 18 cakes