There is a number between 30 and 60. It is a prime number. The digit in the ones place is three less than the digit in the tens place. What is the number?
+592 If it is prime, that means that last number has to be odd. this leaves us with 5 digits for the last one: 1,3,5,7, and 9. but becayse the digit in the units place is 3 less than the digit in the tens place that has to be 3,4, or 5, we have only 1 answer: $\boxed{41}$
