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Answer
Price of coal is up by 40%. Mr Amir must reduce the consumption by what percentage to remain at par. (source: Simplified Mathematics) a) 60 b) 66 c) 2084 d) 60 e) 71.4 Lets think initially the Price of Coal is 100$/Ton and Mr Amir uses 10Tonnes. Hence total value (initially) is 100x10 = 1000$ Now t...
- by coolhabhi
Tue Oct 09, 2018 5:36 am- Forum: Problem Solving
- Topic: Percentages
- Replies: 4
- Views: 853
If x and y are integers, and x/y is not an integer then which of the following must be true? A. x is odd and y is even. B. x is odd and y is odd. C. x is even and y is odd. D. x<y E. None of the above [/spoiler] I randomly assigned values to x and y (5/3, 3/5, 5/4 , 6/4 ) and checked the options. O...
- by coolhabhi
Tue Oct 09, 2018 5:27 am- Forum: GMAT Math
- Topic: DS: Difficulty level: 700, Source: Economist
- Replies: 2
- Views: 1250
Geometry Problem
ABCD is a square and W is the midpoint of side AB. If the side of the square is 16, then the radius of the circle is
A) 2/ [3 + root (5)]
B) 5/ [3 + root (5)]
C) 10/ [3 + root (5)]
D) 15/ [3 + root (5)]
E) 32/ [3 + root (5)]
- by coolhabhi
Tue Jun 13, 2017 10:16 pm- Forum: Problem Solving
- Topic: Geometry Problem
- Replies: 2
- Views: 4054
Pipes and Cisterns
There is a leak in the bottom of a cistern. When the cistern is thoroughly repaired, it would be filled 1(3/2) hrs. Before getting repaired, it takes half an hour longer. If the cistern is full, how long would the leak take to empty the cistern? (1) 24 hrs (2) 28 hrs (3) 32 hrs (4) 36 hrs (5) 40 hrs...
- by coolhabhi
Fri Jan 06, 2017 4:30 am- Forum: Problem Solving
- Topic: Pipes and Cisterns
- Replies: 9
- Views: 3699
Pipes and Cisterns
A tap takes 36 hours extra to fill a tank due to a leakage equivalent to half of its inflow. The inlet pipe alone can fill the tank in how many hours? (1) 18 (2) 24 (3) 30 (4) 36 (5) 40 OE: A I have been banging my head to solve this problem but I am unable to. Could the experts please help me out.
- by coolhabhi
Thu Jan 05, 2017 11:47 am- Forum: Problem Solving
- Topic: Pipes and Cisterns
- Replies: 3
- Views: 6525
A sells an item at 20% profit to B. B sells it to C at 10% profit. C sells it to D at Rs. 16 proft. Different between the cost price of D and cost price of A was Rs. 500. how much did B pay to A for the item? (1) Rs. 1240 (2) Rs. 1250 (3) Rs. 1440 (4) Rs. 1450 (5) Rs. 1400 The Correct question is: ...
- by coolhabhi
Fri Dec 23, 2016 12:48 pm- Forum: Problem Solving
- Topic: Please solve this Profit and loss problem
- Replies: 4
- Views: 4962
Time and Speed
A man covered a certain distance at some speed. If he had moved 3 kmph faster, he would have taken 40 minutes less. If he had moved 2 kmph slower, he would have taken 40 minutes more. What is the the distance in km? A. 36 B. 38 C. 40 D. 42 E. 44 Ans : C Need techniques to answer such questions in mi...
- by coolhabhi
Fri Dec 23, 2016 11:04 am- Forum: Problem Solving
- Topic: Time and Speed
- Replies: 1
- Views: 2762
C is 20% more efficient that A. A and B can do a piece of work in 16 days. B and C can do it in 15 days. in how many days can A alone do the work? a)36 b)42 c)45 d)48 e)54 Let the job = 15*16 units. Since A and B take 16 days to complete the job, the combined rate for A+B = w/t = (15*16)/16 = 15 un...
- by coolhabhi
Fri Dec 23, 2016 6:21 am- Forum: Problem Solving
- Topic: Time &Work
- Replies: 5
- Views: 2710
Time &Work
C is 20% more efficient that A. A and B can do a piece of work in 16 days. B and C can do it in 15 days. in how many days can A alone do the work?
a)36
b)42
c)45
d)48
e)54
AnsD
- by coolhabhi
Fri Dec 23, 2016 5:39 am- Forum: Problem Solving
- Topic: Time &Work
- Replies: 5
- Views: 2710
If |(x–3)^2+2|<|x–7|, which of the following expresses the allowable range for x? (A) 1 < x < 4 (B) 1 < x < 7 (C) – 1 < x < 4 and 7 < x (D) x < – 1 and 4 < x < 7 (E) – 7 < x < 4 and 7 < x Source: Magoosh I tried it by plugging the answer choices (A) 1 < x < 4 which means x is 2 or 3 When ...
- by coolhabhi
Sun Nov 27, 2016 12:21 pm- Forum: Problem Solving
- Topic: Another Tough Absolute & Inequality
- Replies: 7
- Views: 2977
Profit loss problem
A person bought certain quantity of rice at the rate of 150 per quintal. 10% of the rice was spoilt. At what price (per quintal) should he sell the remaining rice to earn 20% profit?
a)170
b)175
c)180
d)200
e)225
OE: D
- by coolhabhi
Sun Nov 27, 2016 8:27 am- Forum: Problem Solving
- Topic: Profit loss problem
- Replies: 2
- Views: 2397
Value of expression
If 2s = a+b+c then the value of [s(s-a)]/3 + [s(s-b)(s-c)]/3 is
a)ab/3
b)bc/3
c)ca/3
d)abc/3
e)a+b+c/3
- by coolhabhi
Fri Nov 25, 2016 1:31 pm- Forum: Problem Solving
- Topic: Value of expression
- Replies: 2
- Views: 1412
Cost price and Selling price
The ratio of cost price to selling price is 5:6. What can be the marked price if a discount of 20% is offered?
a)130
b)135
c)140
d)150
e)160
OE : D
- by coolhabhi
Fri Nov 25, 2016 1:08 pm- Forum: Problem Solving
- Topic: Cost price and Selling price
- Replies: 2
- Views: 1599
Work Time Problem
The ratio of the number of days taken to complete a work by A,B,C is 6:3:2. Working together they complete a work in 20 days. If B left the work before 2 days and C left before 4 days to completion, in how many would the work be completed then? a) 21(1/3) days b) 21(2/3) days c) 22(1/3) days d) 22(2...
- by coolhabhi
Fri Nov 25, 2016 10:24 am- Forum: Problem Solving
- Topic: Work Time Problem
- Replies: 2
- Views: 1460
The problem should indicate that abc ≠0. If a + b + c = 0 then the value of [(a2 + b2 - ab)/ab] + [(b2 + c2 - bc)/bc] + [(c2 + a2 - ca)/ca] is a) -6 b) -3 c) -1 d) 0 e) 1 Let a=1, b=1 and c=-2, with the result that a+b+c = 1+1-2 = 0. Substituting these values into the given expression, we get: [...
- by coolhabhi
Fri Nov 25, 2016 6:59 am- Forum: Problem Solving
- Topic: Value of abc expression = ?
- Replies: 4
- Views: 2050