In the Number Properties guide book, under Data Sufficiency Strategy section it states that "The Statements Never Contradict Each Other" and it goes on to say... "Whenever you find that your statements contradict each other, it means that you've made a mistake!" and on the side note it further emphasizes that "The two data sufficiency statements always provide TRUE information: therefore, the statements cannot contradict each other."

I've re-read the page several times and the examples and I cannot get a clear idea of what it means when "statements never contradict each other" or "TRUE information". Can someone please elaborate in easy language so that I can understand? If you can provide clear examples I would appreciate it. Please help me get over this learning curve. Thank you!