FASM ver

format  PE console
entry   start
include 'win32ax.inc'
include 'api\kernel32.inc'

section '.data' data readable writeable

           x     db  45
           y     db  50
           r_1   dw  ?       ; = 47
           r_2   dw  ?       ; = 75

section '.code' code readable executable

start:    mov  eax, 0

          mov  al, [x]
          mov  bl, [y]
          add  al, bl        ; 1) 45 + 50 = 95
          shr  al, 1         ; 2) 95 / 2  = 47 = r_1
          mov  [r_1], ax
          ;------------------------
          mov  eax, 0
          mov  ebx, 0
          mov  al, [x]
          mov  bl, [y]
          mul  bx            ; 3) 50 * 45 = 2250
          mov  bx, 30
          idiv bx            ; 4) 2250/30 = 75 = r_2
          ;------------------------

          add ax, [r_1]      ; 5) (r_1 + r_2) = (47 + 75) = 122 (answer)
          cinvoke  printf, <"(x + y)/2 + (y * x)/30 =  %d", 10, 0>, eax

          ;------------------------
          cinvoke  scanf, <"%d", 10, 0>, 76313
          invoke   ExitProcess, 0


section '.idata' import data readable
library kernel32, 'kernel32.dll',\
        msvcrt, 'msvcrt.dll'

import msvcrt,\
       printf, 'printf',\
       scanf, 'scanf'