Mathematical and Physical Journal
for High Schools
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Problem P. 3784. (March 2005)

P. 3784. In each of two big tanks there is 100 l of water of a temperature of 10 oC in one and 30 oC in the other. From the warmer tank we pour 1 l of water into the colder one. After blending we pour 1 l of water back. How many times are we to repeat this process to reach at least 5 oC temperature change in both tanks? (Neglect losses.)

(5 pont)

Deadline expired on April 11, 2005.


107 students sent a solution.
5 points:63 students.
1 point:3 students.
0 point:41 students.

Problems in Physics of KöMaL, March 2005