Problem Solving

Hi everyone,

In one of the questions of the Official Guide, I noticed the following:

... Cindy drove her car 290 miles, rounded to the nearest 10 miles ...

According to me, this means she has driven between 285 en 294 miles. In the book, I quote: "Since the miles are rounded to the nearest 10 miles, they can range anywhere from 284 miles to 295 miles."
Rounding 284 to the nearest 10 miles is 280, rounding 295 makes 300 ?!

In the same question, same issue:

... Cindy used 12 gallons of gasoline, rounded to the nearest gallon ...
I quote from the answer: "Since the gallons are rounded to the nearest gallon, they can range anywhere from 11.4 gallons to 12.5 gallons."

Are rounding rules different in the US than they are in Europe?

.maxime. wrote:Hi everyone,

In one of the questions of the Official Guide, I noticed the following:

... Cindy drove her car 290 miles, rounded to the nearest 10 miles ...

According to me, this means she has driven between 285 en 294 miles. In the book, I quote: "Since the miles are rounded to the nearest 10 miles, they can range anywhere from 284 miles to 295 miles."
Rounding 284 to the nearest 10 miles is 280, rounding 295 makes 300 ?!

In the same question, same issue:

... Cindy used 12 gallons of gasoline, rounded to the nearest gallon ...
I quote from the answer: "Since the gallons are rounded to the nearest gallon, they can range anywhere from 11.4 gallons to 12.5 gallons."

Are rounding rules different in the US than they are in Europe?

Rounding rules should be the exact same.

.5 rounds up, .4 rounds down.

So, 11.5 to 12.4 gallons would round to 12; 285 to 294 miles would round to 290.

That's what I thought too... So the book must be wrong.

Stuart Kovinsky wrote:

.maxime. wrote:Hi everyone,

In one of the questions of the Official Guide, I noticed the following:

... Cindy drove her car 290 miles, rounded to the nearest 10 miles ...

According to me, this means she has driven between 285 en 294 miles. In the book, I quote: "Since the miles are rounded to the nearest 10 miles, they can range anywhere from 284 miles to 295 miles."
Rounding 284 to the nearest 10 miles is 280, rounding 295 makes 300 ?!

In the same question, same issue:

... Cindy used 12 gallons of gasoline, rounded to the nearest gallon ...
I quote from the answer: "Since the gallons are rounded to the nearest gallon, they can range anywhere from 11.4 gallons to 12.5 gallons."

Are rounding rules different in the US than they are in Europe?

Rounding rules should be the exact same.

.5 rounds up, .4 rounds down.

So, 11.5 to 12.4 gallons would round to 12; 285 to 294 miles would round to 290.

So why is the answer

D.) 284/12.5 and 295/11.4

Why does 284 round up to 290 and 12.5 round down to 12?

Entirely agree with the above posts.

This surely has to be an error in the book... right!?

I noticed this in the book as well, I suppose you could pick answer D based on the fact they don't have any solution other than miles that is a multiple of 5.

I have another question,

What is 1.99 rounded to the nearest tenth? Is it 2.0?

Thank you Brent and Rich!