What is the mean absolute deviation of 140,115,190,205,120,140,160,200,210 ,190

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.

Hurry if the population of of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill what will the ant population be in 20 days

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?