In simple words, Deductive reasoning refers to the form of rational thought that begins with a basic understanding and comes to a particular inference. It is often alluded to as highest level-down reasoning or going from the basic to the particular.
Deductive reasoning can be seen as a logical method in which the inference is founded on the accordance of several hypotheses, which are usually believed to be valid.
The client only completes 6 out of 10 reps that means the percentage of the max lifted for her is 85%. Take the weight lifted (85 pounds) and divide it by the percentage of completed lifts which is (85%) 85 / 0.85 = 100