There are 56 dogs
2/5 = x/140
140 x 2 = 5 x x
280 = 5x
56 = x
[6] ([3] + [50])
Just make sure you understand how to work backward with problems like this if you are ever confused. :)) good luck!!
Answer:
6 2/3 minutes
Step-by-step explanation:
Their rates in "jobs per hour" are ...
(60 min/h)/(15 min/job) = 4 jobs/h
and
(60 min/h)/(12 min/job) = 5 jobs/h
So, their combined rate is ...
(4 jobs/h) + (5 jobs/h) = 9 jobs/h
The time required (in minutes) is ...
(60 min/h)/(9 jobs/h) = (60/9) min = 6 2/3 min
Working together, it will take them 6 2/3 minutes.
