we have to find lcm of the numbers
15 = $$3\times 5$$
18 = $$2\times 3\times 3$$
27 =Â $$3\times 3\times 3$$
30=Â $$2\times 3\times 5$$
so, lcm =Â $$2\times 3\times 3\times 3\times 5$$
      = 270Â
so, 810 is the only number divisible by 270
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