Here's a maths problem for anyone who's interested. I backed three horses at Cheltenham today, had £1 each way on each and a £2 each way treble, total stake £10. Had a winner at 5/1 and two 2nds at 16/1. Assuming it's 1/4 the odds for a place, how much should I get back? I've used an online betting odds calculator and my calculations don't agree with their result.