Question

How much 40° C water should be mixed with 20 L of 85° C water to
make a 58° C water?

Answer 1

Answer:

30 L is the ans

Step-by-step explanation:

use the mst formula here

20xsx(85-58) = yxsx(58-40)

20x27 = yx18

y is 30

Answer 2

Given :   40° C water should be mixed with 20 L of 85° C water to

make a 58° C water

To Find : How much Water should be mixed

Solution:

Let say  x liter of 40° C water should be mixed  

Final temperature = 58°C

Rise in temperature = 58 - 40 = 18°C

Water = x liter

Water at 85°C =  20 liter

Drop in temperature = 85 - 58  = 27°C

Hence  18 * x =  20 * 27

=> x = 540/18

=> x= 30

so 30 liter of  40° C water should be mixed with 20 L of 85° C water to

make a 58° C water

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