What are the steps in this equation, please?

W

wantoosoon

New member
Joined
Apr 15, 2014
Messages
2
I need to solve the equation (2 d)/(d/518+d/388.5)

I've also attached an image of it, which is clearer. I know the answer is 444, but I don't know how to reach it.

Can anyone help?
 

Attachments

  • Capture.JPG
    Capture.JPG
    10.8 KB · Views: 29
wantoosoon said:
I need to solve the equation (2 d)/(d/518+d/388.5)

I've also attached an image of it, which is clearer. I know the answer is 444, but I don't know how to reach it.

Can anyone help?
Click to expand...
What is the least common denominator of 388.5 and 518? Multiply that amount times each term. Add up and simplify. Try it out.
 
Exact Answer

An exact answer can not be given because 388.5 is not exact.
Indicating one significant decimal digit (rounded).

Answer: 444.0 when d is not zero.
 
wantoosoon said:
I need to solve the equation (2 d)/(d/518+d/388.5)
Click to expand...

Hi wantoosoon:

That's not an equation; it's an expression. (All equations contain an equal sign.)

You're trying to simplify (not solve) this expression, yes?

Can you combine d/518 + d/388.5 into a single ratio?

Divide 2d by your result.

Those are two steps, that you could try. Please show your work!

If you don't know how to add ratios, let us know. :)
 
Bob Brown MSEE said:
An exact answer can not be given because 388.5 is not exact.
Click to expand...

Maybe 777/2 is shown in decimal form 388.5 ?

\(\displaystyle \dfrac{2d}{\dfrac{d}{518} + \dfrac{2d}{777}}\)

PS: You make a good statement, about the domain of d. :cool:
 
Last edited:
Denis said:
Then, if coded in Basic, you get message: "division by 0":rolleyes:

Or code this way:

100 INPUT "enter d";d
110 IF d=0 THEN t=t+1
120 IF t<4 THEN PRINT "d cannot = 0; re-enter": GOTO 100
130 PRINT "go away, dummy!!" : END
Click to expand...

Thanks for your snarky and content-free posts, Denis. There's no need to reply again, though.

I did state that the answer was 444, so it is an equation if you write it mathematically. Anyway, srmichael had the answer - thank you. It is possible to solve for d, which is what I was asking, if not very coherently.
 
Last edited:
wantoosoon, please pay attention and please don't be argumentative.
wantoosoon said:
I did state that the answer was 444, so it is an equation if you write it mathematically.

No, that does not follow logically. It is an expression, not an equation, and it simplifies to 444, provided d does not equal 0.

Anyway, srmichael had the answer - thank you. It is possible to solve for d,

There is no solving for any variable. There is no equation.

which is what I was asking, No, that is not your intent. Your intent is to have that *expression* simplified
(in this case to a constant).

if not very coherently.
Click to expand...

Look at that algebraic fraction you gave in the first post. There is no equals sign. You incorrectly called it an
"equation." And, as it's not an equation, you're not solving for d.
 
Last edited:
You must log in or register to reply here.
Top