73
The / operator divides the first number by the second number. In this case, it divides 9 by 1.5, which is 6
The % operator (called the modulus operator) divides the first number by the second, then returns the remainder. In this instance, it divides 6 by 3, which has no remainder so it returns 0.
The * operator multiplies the first number by the second number. In this case, it multiplies 0 by 63, which gives you 0 again.
The + operator adds the first number to the second number. In this case, it adds 0 to 91, which is 91.
The - operator subtracts the second number from the first number. In this case, it subtracts 18 from 91, which gives you 73.