Never check the answer before attempting the problem. Level L requires setting up equations. If you cannot set up the equation, looking at the answer won't help you understand the mechanics.
The answer book serves as a "solution guide" rather than a mere list of results. At this advanced stage, getting the correct numerical answer is often less important than understanding the step-by-step logic required to reach it. University of California, Berkeley Kumon Answer Book Level I - sciphilconf.berkeley.edu kumon l answer book
Level L is designed to bridge the gap between high school algebra and advanced calculus. The curriculum is structured into several core modules: Never check the answer before attempting the problem