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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


Team Careers360 24th Jan, 2024
Answer (1)
Team Careers360 25th Jan, 2024

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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