conversations.from: human
conversations.value: I need a clearer understanding of how to solve: In mid-May, the depth of a river in Moreland is measured. By mid-June, the river is 10 feet deeper than mid-May. By mid-July, the river is three times deeper than mid-June. If the river is 45 feet deep in mid-July, how many feet deep was the river in mid-May?
conversations.from: assistant
conversations.value: In mid-June, the river is 45/3=15 feet deep.
  In mid-May, the river was 15-10=5 feet deep.