Guessing the number of eggs follows a direct proportion
Some people think, “If 3 hens lay 3 eggs in 3 days, then 12 hens must lay 12 eggs in 12 days.” That sounds logical, but it’s not true!
Misunderstanding the time factor
Many forget to consider the fact that the number of eggs relies on both the number of hens AND the number of days.
Not breaking down the problem into smaller steps

In place of analyzing the question step by step, some rush to reply without fully understanding how the numbers relate.