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One summer day there are 1 5 0 students in a classroom. Each of them generates 6 0 W of heat. All the lamps produce

One summer day there are

150

students in a classroom. Each of them generates

60

W of heat. All the lamps produce

6000

W of heat. The air coming from outside is

15

,

the air leaving the classroom is

25

.

Calculate the flow rate of air kg

/

. (

WRITE TABLES AND ASSUMPTIONS

)

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