What's the answer for 18.75 ÷ 2.5 and how to get the answer by using mental math techniques and the division algorithm?

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Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.