"It's doable,if you times it by two "

That's a spelling mistake or typographical error.

It's double if you times it by two.

Esteemed Guest, I forget whether this came up much earlier in this thread (earlier than I'm prepared to search) or I saw it in a different thread recently but what you describe as a typo might not be. Someone with the same irritation as mine, complained that kids these days often describe the multiplication table as "the times table" and, instead of saying "multiply by two" say "times it by two".

The act (in this case) of doubling is "doable", another term I regard as lacking felicity. But I'm old fashioned about many things.

And in reading back I came across Haruo's gentle commentary on one of my posts; would that such gentleness was universal. As it is I share a corridor with a bunch of academic linguists who might (but haven't to me, yet) be similarly explanatory.

Cheers, Rowan. And have a Happy Christmas.