Условие:

20 + 3640
40 + 5067
90 − (8069)
70 − (32 + 8)
75 + 259
83 + 175

20 + 3640 = 5640 = 16
40 + 5067 = 9067 = 90 − (60 + 7) = (9060) − 7 = 307 = 23
90 − (8069) = (9080) + 69 = 79
70 − (32 + 8) = 7040 = 30
75 + 259 = 1009 = 91
83 + 175 = 1005 = 95