Solve the Division Equation: Finding the Number in ?:1=3

To solve this problem, let's follow a systematic approach:

• Step 1: Recognize the given expression $?:1=3$. This states that a number, when divided by 1, results in 3.
• Step 2: Apply the division property of 1. The rule is $x \div 1 = x$, meaning any number divided by 1 results in the same number.
• Step 3: Utilize the given result $3$ in accordance with the property: Here, $x \div 1 = 3$ implies $x = 3$.

Thus, the solution to the problem is that the number is $\boxed{3}$.

This solution matches directly with , confirming it aligns with the division principle discussed.

Therefore, the solution to the problem is $3$.