Mary has 400 sheep on her farm. She gave a quarter of her sheep to her sister, and half of the remaining sheep to her brother. How many sheep remain with Mary?
Thoughts? Step-by-step reasoning:
Mary gives 1 / 4 * 400 = 100 sheep to her sister. She now has 400 - 100 = 300 sheep remaining. She then gives 1 / 2 * 300 = 150 sheep to her brother. So 300 - 150 = 150 sheep remain.
Thus, the answer is 150.