What will come in place of question mark (?) in the following series questions?
5,10,20,35,55,?

Options

A. A)85
B. B)75
C. C)80
D. D)70

Answer

To find the missing term in the series 5, 10, 20, 35, 55, ?, we can analyze the pattern in the differences between consecutive terms.

### Step-by-step Solution:

1. **Identify the series**: The series given is 5, 10, 20, 35, 55, ?.

2. **Calculate the differences between consecutive terms**:
- From 5 to 10: \(10 - 5 = 5\)
- From 10 to 20: \(20 - 10 = 10\)
- From 20 to 35: \(35 - 20 = 15\)
- From 35 to 55: \(55 - 35 = 20\)

So, the differences are: 5, 10, 15, 20.

3. **Observe the pattern in the differences**:
- The differences themselves form a series: 5, 10, 15, 20.
- This series increases by 5 each time.

4. **Find the next difference**:
- Following the pattern, the next difference after 20 would be \(20 + 5 = 25\).

5. **Add this difference to the last term of the original series**:
- The last term we have is 55.
- So, we calculate: \(55 + 25 = 80\).

6. **Conclusion**:
- The missing term in the series is 80.

### Final Answer:
The term that comes in place of the question mark (?) is **80**.