The task is to generate the correct answer for a given math problem.
--------
Question: Problem: a palindrome is a number that reads the same front - to - back as it does back - to - front ( e . g . 202 , 575 , 1991 , etc . ) p is the smallest integer greater than 500 that is both a prime and a palindrome . what is the sum of the digits of p ?

Answer: 4


Question: Problem: a train running at the speed of 40 km / hr crosses a pole in 9 seconds . what is the length of the train ?

Answer: 100 meter


Question: Problem: a wholesaler wishes to sell 100 pounds of mixed nuts at $ 2.50 a pound . she mixes peanuts worth $ 1.50 a pound with cashews worth $ 5.00 a pound . how many pounds of cashews must she use ?

Answer:
45