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2015-05-31T11:08:48+05:30

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Let the final temperature be T..

  T = [ 30 * 1 * 0⁰ + 200 * 1 * 30⁰ -  30 * 80] / (200 + 30)
     = 360 / 23  = 15.6° C

another way:

heat absorbed by ice cube + water: 30 gm * 80 cal/gm + 30gm * 1cal/gm * T °C
 heat given out by water at 30° C:  200 gm * 1 cal/gm * (30° - T)
           =>  2400 + 30 T = 6000 - 200 T
                         T = 3600 / 230 = 15.6°C

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