The mean of fou numbers is 18, It one af the four numbers is removed, the mean of the three remaining numbers is IV, What is the value of itse number that was removed?

Let's break down the problem step by step: 1. **Initial Information:** - **Mean of four numbers:** 18 - **Total of four numbers:** \( 4 \times 18 = 72 \) 2. **After Removing One Number:** - **Mean of the remaining three numbers:** IV - **Interpretation:** It seems there might be a typo here. If "IV" is intended to mean the Roman numeral for 4, the mean would be 4, which is possible but quite a significant drop from the original mean of 18. - **Alternative Interpretation:** If "IV" was meant to represent "14" (possibly a typo), the calculations would proceed differently. 3. **Calculations Based on Both Interpretations:** - **If the mean is 4:** - **Total of the remaining three numbers:** \( 3 \times 4 = 12 \) - **Number removed:** \( 72 - 12 = 60 \) - **If the mean is 14:** - **Total of the remaining three numbers:** \( 3 \times 14 = 42 \) - **Number removed:** \( 72 - 42 = 30 \) 4. **Conclusion:** - Given the significant drop from a mean of 18 to 4, it's more plausible that "IV" was intended to represent "14." Therefore, the number removed is likely **30**. **Answer:** 30