Question

1)18:2=9 2)9+11=20 3)18*9*20=3240

Answer 1

$1) \: 18 \div 2 = 9 \\ 9 = 9$

$2) \: 9 + 11 = 20 \\ 20 = 20$

$3) \: 18 \times 9 \times 20 = 3240 \\ 162 \times 20 = 3240 \\ 3240 = 3240$