conversations.from: human
conversations.value: Provide a step by step solution for the following math problem: LaKeisha is mowing lawns to raise money for a collector set of books. She charges $.10 for every square foot of lawn. The book set costs $150. If she has already mowed three 20 x 15 foot lawns, how many more square feet does she have to mow to earn enough for the book set?
conversations.from: assistant
conversations.value: She has mowed 900 square feet because 3 x 20 x 15 = 900
  She has earned $90 because 900 x .1 = 90
  She has to earn $60 more dollars because 150 - 90 = 60
  She has to mow 600 more square feet of lawns because 60 / .1 = 600