Decrease 72 in a ratio of $$ 7: 18 $$.

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To **divide** (or "decrease") the number **72** in the ratio $$ 7:18 $$, follow these steps:

1. **Understand the Ratio:**
   
   The ratio $$ 7:18 $$ means that for every **7 parts** of the first quantity, there are **18 parts** of the second quantity.

2. **Calculate the Total Number of Parts:**
   
   $$
   \text{Total parts} = 7 + 18 = 25
   $$

3. **Determine the Value of One Part:**
   
   $$
   \text{Value of one part} = \frac{72}{25} = 2.88
   $$

4. **Find Each Part:**
   
   - **First Part (7 parts):**
     $$
     7 \times 2.88 = 20.16
     $$
   
   - **Second Part (18 parts):**
     $$
     18 \times 2.88 = 51.84
     $$

5. **Conclusion:**
   
   When you divide **72** in the ratio $$ 7:18 $$, the two parts are:
   
   $$
   \boxed{20.16 \text{ and } 51.84}
   $$
To divide 72 in the ratio $$ 7:18 $$, split it into 7 parts and 18 parts. Each part is $$ 2.88 $$. So, the two parts are 20.16 and 51.84.

Decrease 72 in a ratio of \( 7: 18 \).

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