This sign shows when a lift is safe to use.
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?
You must show your working and clearly state 'Yes it is safe' or 'No it is not safe'.
Answers
Given : This sign shows when a lift is safe to use.
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.
To Find : Is the lift now safe to use?
Solution:
Fred and some other people are in the lift and their total mass is 565 kg to the nearest 5 kg.
Hence Weight is 562.5 ≤ W < 567.5
Fred, who has a mass of 88 kg to the nearest kg
=> Fred Weight = 87.5 ≤ F < 88.5
562.5 - 88.5 < Lift weight < 567.5 - 87.5
=> 474 < Lift weight < 480
Hence lift is safe to use as total mass is less than 480 kg
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