Question

45 + { 15 - [ ( 10 - 8 ) + ( 7 - 4 ) - 3 ] - 4 }

Answer 1

45 + { 15 - [ ( 10 - 8 ) + ( 7 - 4 ) - 3 ] - 4 }45 + { 15 - [ (2) + (3) - 3 ] - 4}
45 + { 15 - 2 - 4}
45 + 9
54