Well, if all the positive integers less than 1000 ending in 3 or 7 organized a party, they would probably invite their close friends 13 and 17. And since these numbers are quite generous, they would cover the bill for the rest of the guests. So the sum of all positive integers less than 1000 ending in 3 or 7 is equal to 13 + 17 = 30. But remember, this is just a hypothetical party scenario, and in reality, the actual sum is a bit larger than that.
