'Working Together' Problems

In this video, we work through an example of a "working together" word problem.

[robertrivera]

This video was so simple but made these problems so much easier, thank you SO much

[TheKaramjeet]

This video was understandable and really helpful. Learnt a lot of stuff in 4 min!

[khethomndzebele]

Simpler calculations:
Andy does 1.5 job in 1 hour
Brenda does 1.2 job in 1 hour
Both do 2.7 job in one hour
One job is (60/2.7)

[wildondeleon]

How about directly get the reciprocal?

[subject]

What if the two people took different time to do their jobs?

[parkaxie]

but im so confus how to you get the 200 denaminator??

[gregnixon]

Thanks for using actual math at the end instead of vending machine math just to get an answer.

[christineacabo]

So basically it's only Product over Sum, then simplify. Thank me later.