Question: Can you guide me through solving this problem: At Ashley's school, they start a reforestation campaign where each child plants a tree and each teacher plants 2 trees. The school has 40 classes with an average of 25 students and 3 teachers per class. How many trees will they have planted at the end of the campaign?
Answer: 
40 classes participate in the campaign, representing a total of 40 * 25 = 1000 students.
With 3 teachers per class, 40 * 3 = 120 teachers participate.
With one tree planted per student, 1000 * 1 = 1000 trees are planted per student.
With 2 trees planted per teacher, 120 * 2 = 240 trees are planted per teacher.
Adding the trees planted by teachers and students, 1000 + 240 = 1240 trees will have been planted at the end of the campaign.