High School

This sign shows when a lift is safe to use. The total mass of people must be 480 kg or less. Fred and some other people are in the lift, and their total mass is 565 kg to the nearest 5 kg. Fred, who has a mass of 88 kg to the nearest kg, gets out of the lift. Is the lift now safe to use?

Answer :

Final answer:

Yes, the lift is now safe to use.

Explanation:

According to the information given, the total mass of people in the lift must be 480 kg or less for it to be considered safe. Initially, the total mass of Fred and the other people in the lift is 565 kg. However, when Fred, who has a mass of 88 kg, gets out of the lift, the total mass decreases to 565 kg - 88 kg = 477 kg. Since this is less than the maximum allowed mass of 480 kg, the lift is now safe to use.

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