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Important Formulas
Vedic/Quicker Math
Alligation or Mixture
Area
Average
Banker's Discount
Boats and Streams
Calendar
Chain Rule
Clock
Compound Interest
Decimal Fraction
Height and Distance
Logarithm
Numbers
Odd Man Out and Series
Partnership
Percentage
Permutation & Combination
Pipes and Cistern
Probability
Problems on Ages
Problems on H.C.F & L.C.M
Problems on Numbers
Problems on Trains
Profit & Loss
Races and Games
Ratio and Proportion
Simple Interest
Simplification
Square Root and Cube Root
Stocks and Shares
Surds and Indices
Time and Distance
True Discount
Volume and Surface Area
Practice Questions
Note: You can add tough questions into your favourite list for second revision. 
X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone and then after 4 days Y joined him till the completion of the work. How long did the work last ?  
A.  6 days [Wrong Answer] 
B.  10 days [Correct Answer] 
C.  15 days [Wrong Answer] 
D.  20 days [Wrong Answer] 
View Answer
Explanation:
Answer : B Discuss it below :Work done by X in 4 days = Click here for more comments 
A and B together can complete a work in 1.2 days,. A alone can complete it in 20 days. If B does the work only for half a day daily, then in how many days A and B together will complete the work ?  
A.  10 days [Wrong Answer] 
B.  11 days [Wrong Answer] 
C.  15 days [Correct Answer] 
D.  20 days [Wrong Answer] 
View Answer

A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every Third day ?  
A.  12 days [Wrong Answer] 
B.  15 days [Wrong Answer] 
C.  16 days [Correct Answer] 
D.  18 days [Wrong Answer] 
View Answer

A and B together take 6 days to complete a task. B and C together take 12 days to complete the same task. A and C together take 8 days to complete it. If A, B and C are working together, how long does it take for them to complete the task?  
A.  4(2/3) days [Wrong Answer] 
B.  4 days [Wrong Answer] 
C.  5(1/3) days [Correct Answer] 
D.  1(1/3) days [Wrong Answer] 
View Answer
Explanation:
Answer : C Discuss it below :(1/A)+(1/B) = (1/6) (1/B)+(1/C) = (1/12) (1/A)+(1/C) = (1/8) Solving the three equations, (1/A)+(1/B)+(1/C) = (3/16) Together they take 16/3 = 5(1/3) days to complete the task. Click here for more comments 
B can work 3 times faster than A. They work together on a task and complete it in a day. How long does it take for B alone to complete the task?  
A.  32 hours [Correct Answer] 
B.  48 hours [Wrong Answer] 
C.  3 days [Wrong Answer] 
D.  4 days [Wrong Answer] 
View Answer
Explanation:
Answer : A Discuss it below :Part of task completed by A in a day = 1/x Part of task completed by B in a day = 3/x (B is thrice as efficient as A) (1/x)+(3/x) = 1 4/x = 1 x = 4 B completes 3/4th of the task in a day. He takes 4/3 days to complete the entire task. 4/3 days = (4/3*24) hours = 32 hours Click here for more comments 
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