coolaman

1000/A - 5 = (1000-50)/B ----------------1 (1000-30)/B -5 = 1000/A -----------------2 Solving these equation we get B = 2 m/sec A = 25/12 m/sec Therefore the time taken by A = 1000/(25/12) = 480 seconds.

There is a close call between A and E. But when we look closely, E wins over A because the use of companies' earnings (plural) in E.

Why not D???

If I have not done any calculation mistake then it should be. D. (x + a) / (x - a) = (y + b) / (y - b) or, xy+ay-bx-ba=xy-ay+bx-ab or, ay=bx x/y= a/b x^2/y^2= 2/3 that means x^2+y^2 should be a factor of 5. hence D.

I had to do it manually. Calculated it to some exponents and see after how many exponents last two digits start repeating.

Please post the OE. I think we need to multiply it with 5C4 also because the question doesn't tell anything about the specific four fingers.

I also got 5.

Every 35 minutes they don't work together for 10 minutes. in 180 minutes 50 minutes they have not worked together and 130 minutes they have worked together. Hence A is greater than B.

Why have you not multiplied it by 5C4???? I think we also need to consider the various ways in which we can select four fingers out of five.

D/25 + D/4 = 29/5 Solving this will give us D= 20. Hence C

We can get any value between 3 and 18. Total no. of events is 16. Total no. of ways by which we can get more than 10 is 8 (11, 12, 13, 14, 15, 16, 17, 18). The probability of outscoring Mary is 8/16 = 1/2

4*5*6*7*8*(5C4) = 33600. Lets see what's the OA.

The problem will become more complicated if the order of the rings in one finger will also be considered...

I assumed that not more than one ring should be put in one finger. If there is no such restrictions then the answer should be 4^5= 1024

My answer is 1/2.

C. 74

I get 240.

I got B. 70 persons.

In formal English or in writing, to refer to the present or the future after if when you are talking about something unlikely or untrue, use the past tense. When you are using if to talk about something that might happen in the future, use were not was when the subject of the clause is I, he, she, it, there or a singular noun. For example: If John were here we would win the match. Check these links. http://www.www.urch.com/forums/gmat-sentence-correction/30890-art-museums.html if definition |Dictionary.com See the usage note.

(6*6)/64c9

If you have any specific doubt about run-on, please post that.. Limitations in the later part of the sentence works as resumptive modifier.

Wrongly posted in this thread.

Any number can be broken in a-b form in 31-(3n) ways. For example 3 => 31-3= 28 ways 6=> 31-6 =25 ways 9=> 31-9 = 22 ways and so on.... Total ways = 1+4+7+10+13+16+19+22+25+28 =145 ......... and any number can be broken in a+b form in 3n/2. If the value of 3n/2 is in fraction then the closest value on the higher side. 3 => 3/2 = 2 ways (3+0) and (2+1) 6=> 6/2 = 3 ways (6+0),(1+5) and (2+4) 9=> 9/2 = 5 ways (9+0), (1+8), (2+7), (3+6) and (4+5) and so on....... total ways= 2+3+5+6+8+9+11+12+14+15= 85 Total ways = 145+85 = 230 Total ways of selecting two numbers out of 31 natural no. is 31C2 =465 Probability is 230/465 = 46/93 Let me know if I have missed something.

ramzrambo's formula is one step further from my equation. All three series in my equation are in Geometric progression. (1+2+4+8) can be written as 1*2^0 + 1*2^1 + 1*2^2 + 1*2^3 [Derivation of formula for sum of a GP series Suppose ar^0 + ar^1 + ar^2 ................... +ar^n = X Multiply both sides by (1-r) ar^0 - ar^1 +ar^1 - ar^2 + ar^2........ +ar^n - ar^(n+1) = (1-r) X Therefore X = (ar^0-ar^(n+1)) / (1-r)] In our earlier equation a=1 r= 2 1*2^0 + 1*2^1 + 1*2^2 + 1*2^3 = (1*2^0 - 1*2^(3+1)) / (1-2) Change the sign in numerator and denominator and you will get ( 1*2^(3+1)-1*2^0 ) / (2-1) (2^4 - 1)/(2-1)

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