There are 70 people who are given either drug A or B, and 100 who are given the placebo. This makes the total number of patients 170, 70 of which don't receive the placebo. You then divide 70 by the 170, getting the 41%
They told him no, and with a wave, he was off to commiserate with his protégés. You commiserate together about life's problems. She wanted to commiserate with the horse's assistant, who seemed as awkward in his role as Jessi felt in hers.