Question

1+[3+(4-1)]

7+[12+(3+10)-20]
​

Answer 1

1+[3+(4-1)]

1+[3+3]

1+6

7

7+[12+(3+10)-20]

7+[12+13-20]

7+5

12

Answer 2

1+[3+(4-1)]

1+[3+(3)]

[3+3]

1+[6]

7

7+[12+(3+10)-20]

7+ [12+ (13)-20]

[12+13-20]

[ 25-20 ]

7 + [ 5 ]

12