A cup of tea at temperature ${ 180 }^{ \circ }F$ is placed in a room that is maintained at a constant temperature of ${ 70 }^{ \circ }F$.

The differential equation for its temperature at time $t$ is $\dfrac { dy }{ dt } =-0.11(y-70)$.

After $10\text{ minutes}$ the temperature of the coffee is approximately

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