ubetido,

There is no maths needed here, just a bit of reason.

A horse with a 40% strike rate is very unlikely to miss having at least 2 wins in any preparation of say 8 runs, so even if those wins were the last or 1st. 2 runs, the outs would be no more than 6.

A horse 's SR is pretty much set in stone within it's first 10 starts. If it's SR is 10% [or whatever] as a 3 yr. old, you won't see it with a 30% SR as a 5yr. old. It will be 10% throughout it's career if it stays in reasonably good shape and health.