Choose one of the ten sentence patterns and set the numbers in it. The walkthrough names the base, builds the raw pair, simplifies, and then reads the ratio back out as a percentage so you can check it against the sentence you started with.
“P earns 25% more than Q”
base 100 · 125 : 100 · 5 : 4
Set the pattern to “n times MORE than” to see the ambiguous case handled in full, and set “n% less than” to 100 to see why that sentence has no positive answer at all.