27 13 4 8 4 Overline 1 3

27- [13 + {4-(8 + 4 – )}]

Answers:

27- [13 + {4-(8 + 4 – )}]
= 27 – [13 + {4 -(8 + 4 – 4)}]
= 27- [13 + {4 – 8}]
= 27 – [13 + (-4)]
= 21 – [9]
= 27- 9
= 18