Step-by-step explanation:
Factor of 54
[tex] = 2 \times 3 \times 3 \times 3[/tex]
Factor of 81
[tex] = 3 \times 3 \times 3 \times 3[/tex]
Now ...
Common factor = 3 × 3 × 3
= 27
LCM = common factor × remaining factors..
= 27 × 2 × 3
= 162