Question

Can 2 numbers have 18 as their hcf and 380 as their lcm justify

Answer 1

no there are no such numbers which have 18 hcf and 380 lcm ..
hcf is always a factor of lcm of any 2 number
ex. 6 and 21
hcf = 42
lcm = 3
3 is a factor of 42

again
ex. 3 and 4
lcm = 12
hcf = 1