Question

11-[5-3{4-5+(20-5-6+7)}]

Answer 1

11-[5-3{4-5+16)}]

11-[5-3*15]

11-[-40]

51

Hope it helped you.....

Answer 2

11-[5-3{4-5+(20-5-6+7)}]
11-[5-3{4-5+(16)}]
11-[5-3{15}]
11-[-40]
11+40
51

Hope this will help you

THANKS ✌✌