Question

$27-[18-\{16-(5-\overline{4-1})]=?$
(a) 25
(b) 23
(c) none of these

Answer 1

(b) 23
Explanation:

Given expression:
= 27 $-$ [18 $-$ {16 $-$ (5 $-$ $\overline{4-1}$)}]
= 27 $-$ [18 $-$ {16 $-$ (5 $-$ 3)}] (Removing bar)
= 27 $-$ [18 $-$ {16 $-$ 2}] (Removing parentheses)
= 27 $-$ [18 $-$ 14] (Removing braces)
= 27 $-$ 4 (Removing square brackets)
= 23