"More than" means you are supposed to add. So, you first add 27 + 16, then you add 18 to the result. (Actually, the order in which you add won't affect the result.)
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16 + 16 + 18 + 18 = 68
18+24+16+22 42+38 =80
9 + 8 + 16 + 17 + 18 = 68
12 + 23 + 45 + 67 + 16 + 18 + 45 = 226
16-7+9 = 18