4 + y (10 + b) / 3 Y=9 b=1

The answer would be 37.

Here are the steps. * Also I substituted (replaced) the variables (letters) with the numbers, soo instead of y and b its 9 and 1.

1. simplify 10 + 1 to 11.

2. simplify 9 * 11/3 to 99/3

3. simplify 99/3 to 33

4. 4 + 33 = 37.

4 + 9 (10 + 1) / 3

4+9 (11) / 3

4 + 99/3

4+33

37 is the answer