At what temperature does degree centigrade and Fahrenheit scale become

1.	At what temperature does degree centigrade and Fahrenheit scale become equal?
Answer» \(\frac { C-0 }{ F-32 } \) Let the temperature is x ∴ \(\frac { x }{ 5 } \) = \(\frac { x-32 }{ 9 } \) 9x = 5x – 5 × 32 x = \(\frac { 5\times 32 }{ 4 } \) = -40°C

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