What is the common difference for the arithmetic sequence?

On a architect's drawing of a house, 1 inche representa 1.5

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 three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.