# Fahrenheit and Celsius conversion

• Sep 11th 2009, 05:48 PM
jsu03
Fahrenheit and Celsius conversion
Hey, can someone help me with this problem, I have no idea what to do. Thanks!

At what temperatures will the readings on the Fahrenheit and Celsius thermometers be the same?

I set up a formula and solve for x but I got a wrong answer.
• Sep 11th 2009, 06:28 PM
mr fantastic
Quote:

Originally Posted by jsu03
Hey, can someone help me with this problem, I have no idea what to do. Thanks!

At what temperatures will the readings on the Fahrenheit and Celsius thermometers be the same?

I set up a formula and solve for x but I got a wrong answer.

$C=\frac{5(F - 32)}{9}$.

Substitute $C = F$ and solve for $F$.
• Sep 11th 2009, 07:00 PM
jsu03
Chemistry
So...
F= 1.8(C) +32
F = (1.8(5(F-32)/9) + 32
= 76
I believed I did this wrong. Im still very confuse. Can u tell me what I did wrong.
• Sep 11th 2009, 07:24 PM
skeeter
Quote:

Originally Posted by jsu03
So...
F= 1.8(C) +32
F = (1.8(5(F-32)/9) + 32
= 76
I believed I did this wrong. Im still very confuse. Can u tell me what I did wrong.

$F = 1.8F + 32$

subtract $1.8F$ from both sides ...

$-.8F = 32$

$F = \frac{32}{-0.8} = -40$