O-level Mathematics Nov 05 paper 1 questn 17

[dasani]

17(b) The area of a rectangular room is 22m2, correct to the nearest square metre.
The width is 3 m, correct to the nearest metre.
Find the greatest possible length of the room.



please solve this for me..


and also help me in question 20 which is speed time graph.

 

[OakMoon!]

The greatest possible length comes when the Area is the largest possible and the width is the minimum.... 22.5 is the upper bound for the area... and the lower bound for width is 2.5..
22.5/2.5=9 m is the largest possible length.

 

[dasani]

thanks