Number Systems

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sukhman: Master | Next Rank: 500 Posts; Posts: 202; Joined: Sun Sep 08, 2013 11:51 amFollowed by: 2 members; Thanked: 3 times

by sukhman » Sat Oct 12, 2013 4:46 am

Find the highest power of 175 which divides 344!
Find the highest power of 360 which divides 520!

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Source: Beat The GMAT — Problem Solving | Sat Oct 12, 2013 4:46 am

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Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Sat Oct 12, 2013 5:31 am

sukhman wrote:Find the highest power of 175 which divides 344!
Find the highest power of 360 which divides 520!

Hi sukhman,

What is the source of these questions? The format (i.e., no answer choices) is definitely not that of GMAT questions. Also, while the concepts are sometimes similar to the concepts that the GMAT tests, the numbers used in the questions typically require more "grunt work" than GMAT questions typically require.

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

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sukhman: Master | Next Rank: 500 Posts; Posts: 202; Joined: Sun Sep 08, 2013 11:51 amFollowed by: 2 members; Thanked: 3 times

by sukhman » Sat Oct 12, 2013 5:50 am

It Indian Book called Quantitative Aptitude for CAT By Arun Sharma, well it helps to prepare very well as it is reference book for admission into IIMs. I am actually confused about some of concepts whether we are suppose to divide by increasing powers 7 or 25 175=5*5*7 and in 36 =2*2*2*3*3*5 divide by increasing powers of 5 ? I know the calculations are long sometimes answer choices are given and rarely not.Number systems chapter is very good in this book and because I have studied Maths the Indian way, sometimes its difficult to understand MGMAT books for some concepts when its given easier way here.I think the concepts tested are same for GMAT and IIM-CAT so that can explain Indian people scoring well in Quant, I have not prepared for CAT but referenced MGMAT books earlier but was not easy to grasp everything was more of hit and miss when i solved GMAT questions. GMAT uses more of concepts driven testing where understanding in detail is very important. I am solving exercises for each chapter from here then moving onto GMAT Material.

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GMAT/MBA Expert

Brent@GMATPrepNow: GMAT Instructor; Posts: 16207; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Sat Oct 12, 2013 6:04 am

Here's a similar question: [spoiler]https://www.beatthegmat.com/divisibility-t270225.html[/spoiler]

The skills required to solve that question can be applied to the questions you have asked in this thread.

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

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