Help with algebra problem

[sullengirl99]

The answer to this is 3.41 but my answer is 13.75 so I am way off. Please help me find out how to solve this problem.

A parallel circuit that has resistances of 6.25 ohms and 7.5 ohms has a total resistance of R, where 1/R = 1/6.25 + 1/7.5. What is the total resistance of this circuit?

 

[Bob Brown MSEE]

so far, you are correct

 

[sullengirl99]

Thanks! The Youtube video helped.

3.41 (which is after rounding) is correct.
You need to learn how to add fractions:
http://www.youtube.com/watch?v=lKiR4BBt6TE

 

[bert91373]

Can someone explain?

The answer to this is 3.41 but my answer is 13.75 so I am way off. Please help me find out how to solve this problem.

A parallel circuit that has resistances of 6.25 ohms and 7.5 ohms has a total resistance of R, where 1/R = 1/6.25 + 1/7.5. What is the total resistance of this circuit?

I'm working on the same problem. I watched the video and still did not get 3.41

 

[Quaid]

did not get 3.41

Please show us what you did.