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Important Formulas
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Banker's Discount
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Calendar
Chain Rule
Clock
Compound Interest
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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 Trains
Profit & Loss
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Ratio and Proportion
Simple Interest
Simplification
Square Root and Cube Root
Stocks and Shares
Surds and Indices
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Time and Work
True Discount
Volume and Surface Area
Practice Questions
Note: You can add tough questions into your favourite list for second revision. 
If the sum of two numbers is 33 and their difference is 15, the smaller number is :  
A.  9 [Correct Answer] 
B.  12 [Wrong Answer] 
C.  15 [Wrong Answer] 
D.  18 [Wrong Answer] 
View Answer
Explanation:
Answer : A Discuss it below :Let the numbers be x and y. Then, x + y = 33 ...(i) and x  y = 15 ...(ii) Solving (i) and (ii), we get : x = 24, y = 9. ∴ Smaller number = 9. Click here for more comments 
The sum of two numbers is 25 and their differenee is 13. Find their product :  
A.  104 [Wrong Answer] 
B.  114 [Correct Answer] 
C.  315 [Wrong Answer] 
D.  325 [Wrong Answer] 
View Answer
Explanation:
Answer : B Discuss it below :Let the numbers be x and y. Then, x + y = 25 and x  y = 13. 4xy = (x + y)^{2}  (x  y)^{2} = (25)^{2}  (13)^{2} = 625 169 = 456 => xy = 114. Click here for more comments 
If the sum of a number and its square is 182, what is the number ?  
A.  15 [Wrong Answer] 
B.  26 [Wrong Answer] 
C.  28 [Wrong Answer] 
D.  13 [Correct Answer] 
View Answer
Explanation:
Answer : D Discuss it below :Let the number be x. Then, x + x^{2} = 182 <=> x^{2} + x  182 = 0 <=> (x + 14) (x  13) = 0 <=> x = 13. Click here for more comments 
Three numbers are in the ratio of 3 : 4 : 6 and their product is 1944. The largest of these numbers is :  
A.  6 [Wrong Answer] 
B.  12 [Wrong Answer] 
C.  18 [Correct Answer] 
D.  None of these [Wrong Answer] 
View Answer
Explanation:
Answer : C Discuss it below : Let the numbers be 3x, 4x and 6x. Then, 3x x 4x x 6x = 1944 <=> 72x^{3} = 1944 <=> x^{3} = 27 ,=> x = 3 ∴ Largest number = 6x = 18, Click here for more comments 
The sum of the squares of three numbers is 138, while the sum of their products taken two at a time is 131. Their sum is :  
A.  20 [Correct Answer] 
B.  30 [Wrong Answer] 
C.  40 [Wrong Answer] 
D.  None of these [Wrong Answer] 
View Answer

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