<|system|>
Two interior angles of a convex pentagon are right angles and the other three interior angles are congruent. In degrees, what is the measure of one of the three congruent interior angles?</s>.
<|user|>
Can you answer based on context?
<|assistant|>
The sum of the interior angles of a polygon with $n$ sides is $180(n-2)$. The pentagon has 5 sides, so the sum of the interior angles is $180\cdot3$. We subtract the degree measures of the two right angles to get $180\cdot3-90-90=180\cdot2$, which is the sum of the measures of the three congruent interior angles. We divide by 3 to get the measure of one of the three congruent interior angles: $\frac{180\cdot2}{3}=60\cdot2=120^\circ$.