+0  
 
+1
96
1
avatar+544 

https://vle.mathswatch.co.uk/images/questions/question16609.png

 

 

winkwinkwink

lynx7  Feb 13, 2018
edited by lynx7  Feb 13, 2018
edited by lynx7  Feb 13, 2018
edited by lynx7  Feb 13, 2018
edited by lynx7  Feb 13, 2018
 #1
avatar+86859 
+2

565 kg to the nearest 5 kg  means that the total weight of the people on

board, W,   could be represented as

 

562.5 < W < 567.5

 

But Fred's weight, F, could be represented as

 

87.5 < F < 88.5

 

Let's assume the lower bound for Fred....this makes the elevator as heavy as possible 

 

So....when he gets out of the elevator......the greatest possible total weight will now be  less  than

 

567.5 - 87.5  =    480 kg

 

So...it is safe to ride

 

 

cool cool cool

CPhill  Feb 13, 2018
edited by CPhill  Feb 13, 2018

11 Online Users

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.