Question : Direction: On one side of a street are even numbers and on the other side are odd numbers. No.1 is exactly in front of No. 2. My house is No. 9. From my house, a man comes up from No. 2 and knocks at the door, five doors beyond the house infront of me. What is the No. of that house?
Option 1: 18
Option 2: 20
Option 3: 22
Option 4: 26
Correct Answer: 18
Solution : Given :
| Street 1(odd numbers) | Street 2 (even numbers) |
| No. 1 | No. 2 |
| No. 3 | No. 4 |
| No. 5 | No. 6 |
| No. 7 | No. 8 |
| No. 9 | No. 10 |
| No. 11 | No. 12 |
| No. 13 | No. 14 |
| No. 15 | No. 16 |
| No. 17 | No. 18 |
| No. 19 | No. 20 |
A man comes up from → No. 2
My house → No. 9
A man knocks at 5 doors beyond the house in front of me
Therefore, he starts knocking from
No.10 (in front of No.9)
5 doors beyond the house
→ No.10, No.12, No.14, No.16,
No.18
So, he will knock at No. 18.
Hence, first option is correct.
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