1.

At what temperature ""^(@)C=""^(@)F

Answer»

`-30^(@)`
`-40^(@)`
`-20^(@)`
Not possible

Solution :`""^(@)F= 9/5 (""^(@)C)+32 "" F=C`
`""^(@)C=9/5 (""^(@)C)+32`
`5""^(@)C=9""^(@)C+32xx5`
` - 4""^(@)C=32xx5`
`""^(@)C= - 40`


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