A liquid of specific heat 0.5 cal/g^(0)c...

A liquid of specific heat 0.5 cal/`g^(0)`c at `60^(0)`C, is mixed with another liquid of specific heat 0.3 cal/`gm^(0)`c at `20^(0)`C. After mixing, the temperature of the mixture becomes `30^(0)`C. In what proportion by weight are the liquids mixed ?

`1:2`

`3:4`

`4:5`

`1:5`

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