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What are the number of degrees of freedom if the number of variables and number of equations are 15 and 5 respectively?

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What are the number of degrees of freedom if the number of variables and number of equations are 15 and 5 respectively?

(a) 5

(b) 10

(c) 15

(d) 20

I got this question by my school principal while I was bunking the class.

I want to ask this question from Solving Material and Energy Balances Using Process Simulators in division Humidity Charts & their Use, Analysis of the Degrees of Freedom in a Steady – State Process, Solving Material and Energy Balances Using Process and Unsteady State Material and Energy Balances of Basic Chemical Engineering

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Best answer
Right choice is (b) 10

The explanation: Number of degrees of freedom = 15 – 5 = 10.

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