Answer:
324 teachers
Step-by-step explanation:
3 teachers of every 50 students
__ teachers of 5400 students
so,

therefore,

She will solve 20 problems in 2.5 hours, 4*5 thirty minute sessions=20.
Answer:
prime numbers
Step-by-step explanation:
not composite since,example, 2 is prime
not even since,example, 19 is odd
not odd since,example, 2 is even
there are 6 faces multiply 25 by 6
25*6=150cm^2