let's break down the code:

a = 5: This line assigns the integer value 5 to the variable a.

b = "10": This line assigns the string "10" to the variable b.

print(a + int(b)): Here, int(b) converts the string "10" to an integer, resulting in 10. Then a + int(b) adds the integer value of b (which is 10) to the value of a (which is 5), resulting in 15. So, this line will print 15.

print(str(a) + b): Here, str(a) converts the integer a into a string, resulting in "5". Then "5" + b concatenates the string "5" with the string "10", resulting in "510". So, this line will print "510".

So, the output of the code will be:

15

510