math

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3 h 20 min
4 h 25 min
+ 5 h 35 min=13 hrs 20 min

9 lb 15 oz
- 5 lb 8 oz=4 lbs 7 oz

Mark uses 1 pt 9 fl oz and then 2 pt 10 fl oz from a container of film
developer that holds 3 qt. How much of the developer remains?=1 pt 13 oz

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