By how much should 84.5 be decreased to get 27.84?

Answer

To solve the problem of how much should 84.5 be decreased to get 27.84, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the numbers involved**: We have two numbers: 84.5 (the original number) and 27.84 (the target number).

2. **Set up the equation**: We need to find a number \( X \) that, when subtracted from 84.5, gives us 27.84. This can be expressed as:
\[ 84.5 - X = 27.84 \]

3. **Rearrange the equation**: To find \( X \), we can rearrange the equation to isolate \( X \):
\[ X = 84.5 - 27.84 \]

4. **Perform the subtraction**: Now, we will subtract 27.84 from 84.5:
\[ 84.5 - 27.84 = 56.66 \]

5. **Conclusion**: Therefore, the amount by which 84.5 should be decreased to get 27.84 is:
\[ X = 56.66 \]

### Final Answer:
84.5 should be decreased by 56.66 to get 27.84.