cube root

cat er ina wrote:Which of the following is the closest to ∛ 2.539 (cube root of 2.539) ?
Can someone help me with this one please?

You luckily have 2539/1000 to determine the cube root of. Rough estimation takes it somewhere around 2500/1000 = 20/8. Now, cube root of 8 is 2, and that of 20 is pretty less than 3, it'll be nearly 2.7 or something. So the cube root of 2.539 will be very close to [spoiler]1.35[/spoiler], as per my figment of imagination. Where are the options that were following in the stem?

I assure you that the GMAT would never put you in such trouble ever. Moreover, if a math question is not in the ideal PS form of GMAT, then please post the same in the GMAT MATH forum of beatthegmat.

Best wishes

what are the options?

sanju09 wrote:

cat er ina wrote:Which of the following is the closest to ∛ 2.539 (cube root of 2.539) ?
Can someone help me with this one please?

You luckily have 2539/1000 to determine the cube root of. Rough estimation takes it somewhere around 2500/1000 = 20/8. Now, cube root of 8 is 2, and that of 20 is pretty less than 3, it'll be nearly 2.7 or something. So the cube root of 2.539 will be very close to [spoiler]1.35[/spoiler], as per my figment of imagination. Where are the options that were following in the stem?

I assure you that the GMAT would never put you in such trouble ever. Moreover, if a math question is not in the ideal PS form of GMAT, then please post the same in the GMAT MATH forum of beatthegmat.

Best wishes

well I guess we could say that when you think this gmat test can t get worst it really does because I found this during my test about two months ago and just looked at it for 2 minutes clueless..lol..

cat er ina wrote:

sanju09 wrote:

cat er ina wrote:Which of the following is the closest to ∛ 2.539 (cube root of 2.539) ?
Can someone help me with this one please?

You luckily have 2539/1000 to determine the cube root of. Rough estimation takes it somewhere around 2500/1000 = 20/8. Now, cube root of 8 is 2, and that of 20 is pretty less than 3, it'll be nearly 2.7 or something. So the cube root of 2.539 will be very close to [spoiler]1.35[/spoiler], as per my figment of imagination. Where are the options that were following in the stem?

I assure you that the GMAT would never put you in such trouble ever. Moreover, if a math question is not in the ideal PS form of GMAT, then please post the same in the GMAT MATH forum of beatthegmat.

Best wishes

well I guess we could say that when you think this gmat test can t get worse it really does because I found this during my test about two months ago and just looked at it for 2 minutes clueless..lol..

can t remember options sorry

i think for this question i would try solving backwords
i know cuberoot of 2 is around 1.25
so i will try to search option in that range...

if they give you 1.28 and 1.31 and so on ...very lucky....
After all i think 700 is also much about luck

The method mentioned in above post doesnt work for all numbers i guess

cat er ina wrote:Which of the following is the closest to ∛ 2.539 (cube root of 2.539) ?
Can someone help me with this one please?

If this question were to read as 'Which of the following is the closest to 2.236 * (cube root of 2.236) ?'
it would have been quite an interesting GMAT like question.