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# If 4 moles of an ideal monoatomic gas at temperature $400 \;K$ is mixed with 2 moles of another ideal monoatomic gas at temperature $700\;K$ the temperature of the mixture is :

$\begin {array} {1 1} (a)\;550^{\circ}C & \quad (b)\;500^{\circ}C \\ (c)\;550\;K & \quad (d)\;500\;K \end {array}$

$(D) 500\;K$
Hence D is the correct answer.