What is the value of 6 if it the problem reads 0.679?

Ineed to know how to write question one in mathematical terms

Which problem would you use the following proportion to solve for? 24/x=40/100 a. what is 40% of 24? b. what percent is 24 of 40? c. twenty-four is 40% of what number? d. forty percent of 24 is what number?

For questions 1–3, use the differential equation given by dx equals x times y divided by 3, y > 0.