The LCM of 40, 20, 195 and 160 is:

Prime factorization:

$40 = 2^3 \times 5$

$20 = 2^2 \times 5$

$195 = 3 \times 5 \times 13$

$160 = 2^5 \times 5$

Now take the highest powers of all prime factors:

Highest power of 2 = $2^5$

Highest power of 3 = 3

Highest power of 5 = 5

Highest power of 13 = 13

So,

$\text{LCM} = 2^5 \times 3 \times 5 \times 13$

$= 32 \times 3 \times 5 \times 13$

$= 96 \times 5 \times 13$

$= 480 \times 13$

= 6240