The value of 79 - 10 × [ 2 + 3 × { 12 - 6 ( 6 - 5 ) × 2} ÷ 20] is:

Given:
79 - 10 × [ 2 + 3 × { 12 - 6 ( 6 - 5 ) × 2} ÷ 20] 
Solution:
79 - 10 × [ 2 + 3 × { 12 - 6 ( 6 - 5 ) × 2} ÷ 20] 
= 79 - 10 × [ 2 + 3 × { 12 - 6 × 2} ÷ 20] 
= 79 - 10 × [ 2 + 3 × { 12 - 12} ÷ 20]
= 79 - 10 × [ 2 + 3× { 0} ÷ 20]

= 79 - 10 × [ 2 + 3× { 0}]

= 79 - 10 × [ 2 + 0] 

=  79 - 10 × [ 2] 
= 79 - 20 
= 59