A container contains temperature of water 80°C .after every 10 minutes the change in temperature is -4°C .after how much time will the temperature of water be 20°C?
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temperature of the water = 80°C
no. of minutes takes to change = 10 minutes
degree changed after every ten minutes = -4°C
time taken to change the temperature from 80°C to 20°C = 80-20=60
=60/4
=15
= 15 × 10 = 150 minutes
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