Current estimates are that about 25% of all deaths are due to cancer, and of the deaths

Question:

Current estimates are that about 25% of all deaths are due to cancer, and of the deaths that are due to cancer, 30% are attributed to tobacco, 40% to diet, and 30% to other causes.
a. Define events, and identify which of these four probabilities refer to conditional probabilities.
b. Find the probability that a death is due to cancer and tobacco.