12-9=3
3+12+4,5=19,5
19 hours and 30 min
7:54...10:55 - 33 minutes is 10:22. Then subtract 2 hours, brings you to 8:22. Then subtract 28 minutes, and is 7:54
Answer:
29
Step-by-step explanation:
25+4
you take the final amount and add what was taken to find the initial value
Team X : 1min --> 1/15 chairs
Team Y : 1min --> 1/20 chairs
Team X&Y : 1min --> 1/15 + 1/20 = 7/60 chairs
X min --> 60/60 chairs
X= 60/7 min