Just think the word "of" is referring to mathematical term "multiplication". Now that you know what the word 'of' means let's work out our problem, shall we?
Step 1: multiply the numbers the one we started out with from each other
24×1 1/4 is 30 Jake reads 24 per day 24×5=121 168-121=47 Julio reads 30 per day 30×5=150 180-150=30 Jake will have 17 more pages left to read than Julio.