if a>b>c>0 and abc=231. Find a+b+c? -one of the options is cannot be determined and the others are some two digit integer.

source?

21 is the answerâ€¦ As abc=231â€¦which is equal to 3.7.11

Three prime numbersâ€¦as a>b>c so 11>7>3.

Though this is there just got confirmation of the values. Doesnâ€™t matter in which way the numbers are arranged.

a+b+c =11+7+3 =21

Its from counselling class test called greedgeâ€¦

I do think I remember this option was there. but how did you arrive at it given it is a time-based and juggling the numbers will totally be a waste of time?

Lol by practice â€¦I literally solved this without a pen or paper and in 10 seconds I swear â€¦My NIT degree is of some worth I suppose XDâ€¦but itâ€™s mostly practice! Lol, youâ€™ll get thereâ€¦I have my GRE tomorrow. Wish me luck!

All the best !!!

What are the materials you have used for practice? The concepts are clear for me but need practiceâ€¦

Thanksâ€¦Arrived at it because of a+b+c. Now see a+b+c doesnâ€™t depend on what you choose the valuesâ€¦a>b>c is there to confuse youâ€¦if they wouldâ€™ve asked you the values of a, b and c separately then the inequality would have made senseâ€¦

Manhattan 5lbâ€¦ETS and Gregâ€™s problems bunch of stuffs here and thereâ€¦whenever I got bored of English I studied quantâ€¦Also strong base since childhoodâ€¦there cannot be any replacement for thatâ€¦my mumâ€™s a mathematician and dadâ€™s an IITian so probably runs in the family!

You can try one thingâ€¦Try making your own problemsâ€¦that really heightens the critical thinking skillsâ€¦how can I modify the problem so that people are not able to solve in the first placeâ€¦try doing mental maths and practice everyday!

Haha makes sense nowâ€¦ but thanks for clarifyingâ€¦ Also for verbal - is there anything more you had done to help you out?

Math was actually my strongest point but years of working in the IT industry drove me away from the subject

Refer aboveâ€¦well Gregâ€™s So YOu Think You Know Words are 24 carat goldâ€¦trust meâ€¦just mug them up like thereâ€™s no tomorrow and apply his strategiesâ€¦I am not a fast reader and 2 months cannot make me a fast readerâ€¦My strategy is solving around 17 problems with 98% accuracy and guessing the last 3!

Happens to the best of us :â€™(

Really smart choice regarding pace and dash at the end for RC so you can bag some correct answers

Try coming up with something crazy like an equivalent of soduku by Maki Kaji who recently passed away!..Sudoku blows my mind!

Totallyâ€¦another thing would be if you are working itâ€™s very difficult to focus on GRE because for me I graduated 5 years agoâ€¦I had forgotten most of itâ€¦while solving I used to visit a lot of differentiation, physics and integral conceptsâ€¦even coordinateâ€¦ellipse and allâ€¦It brought back so many memories of high schoolâ€¦I loved science then and nowâ€¦if you do these time to time itâ€™s a good refresher I believeâ€¦also some trig here and thereâ€¦though not disparaging anyoneâ€¦This is not requiredâ€¦Itâ€™s what kept me going other than Greg sagacious yet cheeky aphorismsâ€¦Also I read few pages of a story book every nightâ€¦I canâ€™t get myself to the level of reading Carl Sagan though I admire him a lotâ€¦but unintelligible vocab throws me offâ€¦so I stuck with fiction

Currently reading Arundhati Royâ€™s The God of Small Things!

Really appreciate it @koala for your insightful thoughts. Iâ€™m sure this might take me back to â€śtheâ€ť days. Will give it a go.

I think a quick and efficient way of figuring it out without just doing random numbers is dividing 231 by a few numbers. I knew it couldnâ€™t be divided by 2, 4, 5, or 6 since it ends with a one so I tried 3 and got 77 which was fairly easy to see could be divided into 7 and 11 and it worked. So maybe just try to divide it by a certain number and go from there!

That could also work plus you got calculator to the calculations quickly. A little thing to add is if you memorize the divisibility rules then you can immediately tell if a number is divisible by a number in the range 1-10 . For eg: Divisibility by 3 is if the sum is divisible by 3 then the number is divisible by 3, thus 2+3+1=6 & we know 6 is divisible by 3 thus 231 is divisible by 3.