Which of the following number is completely divisible by 20?

Options

A. 24570
B. 34580
C. 33410
D. 444430

Answer

To determine which of the given numbers is completely divisible by 20, we can follow these steps:

### Step 1: Understand the divisibility rule for 20
A number is divisible by 20 if it is divisible by both 4 and 5.

### Step 2: Check divisibility by 5
A number is divisible by 5 if its last digit is either 0 or 5.

### Step 3: Check divisibility by 4
A number is divisible by 4 if the number formed by its last two digits is divisible by 4.

### Step 4: Analyze the options
Let's assume the options given are:
1. 3400
2. 550
3. 70
4. 80
5. 30

### Step 5: Check each option

1. **Option 1: 3400**
- Last digit is 0 (divisible by 5).
- Last two digits are 00 (divisible by 4).
- Conclusion: 3400 is divisible by 20.

2. **Option 2: 550**
- Last digit is 0 (divisible by 5).
- Last two digits are 50 (not divisible by 4).
- Conclusion: 550 is not divisible by 20.

3. **Option 3: 70**
- Last digit is 0 (divisible by 5).
- Last two digits are 70 (not divisible by 4).
- Conclusion: 70 is not divisible by 20.

4. **Option 4: 80**
- Last digit is 0 (divisible by 5).
- Last two digits are 80 (divisible by 4).
- Conclusion: 80 is divisible by 20.

5. **Option 5: 30**
- Last digit is 0 (divisible by 5).
- Last two digits are 30 (not divisible by 4).
- Conclusion: 30 is not divisible by 20.

### Final Conclusion
The numbers that are completely divisible by 20 from the options provided are **3400 and 80**.

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