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The explanation for the given correct answer is that the question states that X is the father of Y, but then Y is not X's son. This implies that Y must be a girl, as only a daughter can be the child of a father. Therefore, the correct answer is "Because Y is a girl, so she can only be his daughter."

The correct answer is "The four you took" because the question asks how many oranges you have after taking away 4 from the original 6. So, you still have the 4 oranges you took away, resulting in a total of 4 oranges.

The correct answer is that the little boy must have kicked the ball upwards, and gravity pulled it right back down. This explanation is based on the concept of gravity, which is the force that pulls objects towards the center of the Earth. When the boy kicks the ball upwards, it gains some initial velocity. However, due to the force of gravity, the ball eventually slows down and starts moving back towards the ground. Therefore, it comes back to the boy after traveling a certain distance.

The correct answer is that the egg won't crack the concrete floor. This is because concrete is a hard and solid surface, which can withstand the impact of the egg without breaking. Unlike a softer surface, such as a wooden floor or carpet, the concrete floor provides enough support to prevent the egg from cracking upon impact.

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Stairs go up and down as people walk on them, but they remain in the same place as a fixed structure within a building. Unlike traffic lights, which change position to control traffic flow, stairs are stationary and provide a means of vertical movement within a building. Similarly, a lift or elevator may move up and down, but it is not fixed in one place like stairs. A ladder can be moved and placed in different locations, so it does not fit the description of remaining in the same place.

The correct answer is "It would be difficult since he is dead." This answer is correct because the question is asking if it is legal for a man to marry his widow's sister. However, since the man is already dead, it is not possible for him to marry anyone. Therefore, it would be difficult for him to marry his widow's sister.

The correct answer is "By sleeping at night time." This answer is correct because it suggests that the young woman can get eight hours of sleep by following a regular sleep schedule and sleeping during the night when it is typically considered the optimal time for rest and rejuvenation. Sleeping at night time allows for a more consistent and uninterrupted sleep, which can contribute to better overall sleep quality and duration.

The reason Gwendoline stops seeing her brother's graffiti after a while is because he has written it somewhere without any lighting at night. This means that when it gets dark, there is no light to illuminate the graffiti, making it impossible for Gwendoline to see it.

The correct answer is "It would take no time at all to build it." This is because the statement implies that the wall has already been built by the 10 men. Therefore, the five men would not need any additional time to build it.