what per cent of 40 m is 16 m?
1 kg is 25 g?
3.5 litres is 700 ml?

Answer

To solve the question "What percent of 40 m is 16 m?", "1 kg is 25 g?", and "3.5 litres is 700 ml?", we will break it down step by step.

### Step 1: Calculate what percent of 40 m is 16 m

1. **Set up the equation**: Let the percentage be \( x \). We can express this as:
\[ \frac{x}{100} \times 40 = 16 \]

2. **Rearrange the equation**: To find \( x \), we can rearrange the equation:
\[ x = \frac{16 \times 100}{40} \]

3. **Calculate**: Now, perform the calculation:
\[ x = \frac{1600}{40} = 40 \]

4. **Conclusion**: Therefore, 16 m is **40%** of 40 m.

### Step 2: Calculate what percent of 1 kg is 25 g

1. **Convert units**: First, we need to convert 1 kg to grams:
\[ 1 \text{ kg} = 1000 \text{ g} \]

2. **Set up the equation**: Let the percentage be \( x \). We can express this as:
\[ \frac{x}{100} \times 1000 = 25 \]

3. **Rearrange the equation**: To find \( x \), we can rearrange the equation:
\[ x = \frac{25 \times 100}{1000} \]

4. **Calculate**: Now, perform the calculation:
\[ x = \frac{2500}{1000} = 2.5 \]

5. **Conclusion**: Therefore, 25 g is **2.5%** of 1 kg.

### Step 3: Calculate what percent of 3.5 litres is 700 ml

1. **Convert units**: First, we need to convert 3.5 litres to millilitres:
\[ 3.5 \text{ litres} = 3500 \text{ ml} \]

2. **Set up the equation**: Let the percentage be \( x \). We can express this as:
\[ \frac{x}{100} \times 3500 = 700 \]

3. **Rearrange the equation**: To find \( x \), we can rearrange the equation:
\[ x = \frac{700 \times 100}{3500} \]

4. **Calculate**: Now, perform the calculation:
\[ x = \frac{70000}{3500} = 20 \]

5. **Conclusion**: Therefore, 700 ml is **20%** of 3.5 litres.

### Summary of Results
- 16 m is **40%** of 40 m.
- 25 g is **2.5%** of 1 kg.
- 700 ml is **20%** of 3.5 litres.