simplyfing an an addition of two fractions

[BigBeachBanana]

2/ 4/15 =15/2 =0.3333

2/(4/15)=2.5

You see, parenthesis makes a difference; the problem is you didn't use parenthesis properly. That's why Dr Khan asked you to redo.

eddy2017 said:
(2 * 2/3) + 2 * 2/5) / 15/4

This step is incorrect. Please review it and post the corrected step.

 

[eddy2017]

(2*2/3) + (2*2/5)* 15/4

is this correct now

 

[eddy2017]

or should it be

(2*2/3 + 2 *2/5) * 15/4
this is the way the teacher has it in his video

 

[BigBeachBanana]

(2*2/3) + (2*2/5)* 15/4

is this correct now

This is not the step we asked you to redo. Rewrite the expression below with the correct parenthesis. As a check, plugin what you wrote exactly as in in the calculator and see if you get 4 1/3.

eddy2017 said:
(2 * 2/3) + 2 * 2/5) / 15/4

 

[eddy2017]

(2*2/3 + 2 *2/5) * 15/4
this is the way it is in the video and it does not affect the result.

 

[BigBeachBanana]

(2*2/3 + 2 *2/5) * 15/4
this is the way it is in the video and it does not affect the result.

What about what you wrote in post #4? Type what you wrote here and see if you get the same thing?
(2 * 2/3) + 2 * 2/5) / 4/15 --------------------I multiply by the multiplicative inverse to get rid of the fractional form

 

[eddy2017]

I had to go out. I'm not home right now
I will check everything when o come back home

I had to go out. I'm not home. I'll check everything when I come back

I will rewrite the equation and do it from the beginning.

 

[Deleted member 4993]

It is incorrect when you write /(15/4) when you say that you are multiplying by 15/4 which is written as *(15/4).

Yes, you did not use parenthesis but I am not concerned with this right now. You clearly wrote /15/4 which means that you are dividing by 15/4

That is incorrect!

x/15/4 .......from left to right with equal rank of operation.

That turns out (x/15)/4 → \(\displaystyle \frac{\frac{x}{15}}{4}\) → \(\displaystyle \frac{x}{15*4}\)