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23 May 2007, 17:07
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In the number 1.4ab5, a and b represent single positive digits. If x = 1.4ab5, what is the value of 10 – x?
(1) If x is rounded to the nearest hundredth, then 10 – x = 8.56.
(2) If x is rounded to the nearest thousandth, then 10 – x = 8.564
(1) If x is rounded to the nearest hundredth, then 10 – x = 8.56.
(2) If x is rounded to the nearest thousandth, then 10 – x = 8.564
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23 May 2007, 18:11
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He is right that the answer is B but the rounding is wrong since if a number is 5 you round up so its 1.4365 but thats trivial.
A good approach for this is to write it down as:
10.0000
01.4ab5
since you want to know what a and b are you need to get at least to the thousandths position, so that right there tells you that at a minimum the solution must provide you with that level of detail.
