What is a comparison of numbers or variables that can be written in fraction form

The multiplication property of zero states that the product of any number and 0 is 0. what must be true about either a or b to make ab=0

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

Mr. roseanne will buy 12 1/2 pounds beef for for a cookout. the price for the first 3 pounds of beef is $4.99 per pound. after that, the price is $4.49 per pound. how much will mr. roshan pay for the beef