Question

8 : 2 + [ 15 - ( 4 . 2 + 1 ) ]

Answer 1

8/2 + [15 - 9] = 4 + 6 = 10

Answer 2

8 : 2 + [ 15 - ( 4 . 2 + 1 ) ]
4 + [ 15 - ( 8 + 1 ) ]
4 + [ 15 - ( 9 ) ]
4 + [ 15 - 9 ]
4 + [ 6 ]
4 + 6
10