Sara's house is 100 square feet larger than 2 times Nada's house. If Sara's house is 1000 square feet, how many square feet is Nada's house? Let's answer step by step:
Let the number of square feet in Nada's house be y. 2y + 100 = 1000. 2y = 900. Meaning, y = 450 square feet. The answer: 450.