23
Q:

If a+b=5 and 3a+2b=20,then (3a+b)will be :

 

A) 20 B) 15
C) 25 D) 30

Answer:   C) 25



Explanation:

a+b=5   ...(1)    and    3a+2b=20 ...(2)

 

Multiplying (1) by 2 and subtracting from (2), we get : a=10.

 

Putting a=10 in (1), we get : b=-5

 

Therefore,   (3a+b) = 3 x 10+(-5)=30-5=25.

Subject: Simplification
Exam Prep: CAT
Job Role: Bank Clerk
Q:

(a - b)2 + 2ab = ?

 

A) a2 - b2 B) a2 + b2
C) a2 - 4ab + b2 D) a2 -  2ab + b2
 
Answer & Explanation Answer: B) a2 + b2

Explanation:
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0 2635
Q:

1960.196=19.6xthen what will be the value of x?

 

A) 1.96 B)  10.96
C)  0.0196 D) 0.196
 
Answer & Explanation Answer: C)  0.0196

Explanation:
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0 3820
Q:

If cosθ = 4/5, then (secθ + cosecθ) =

 

A) 7/5 B) 15/12
C) 35/12 D) 12/5
 
Answer & Explanation Answer: C) 35/12

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1 3330
Q:

10 dozen apples, 15 dozen mangoes & 20 dozen oranges are kept for sale. 1/2, 1/3rd & 1/4th of each item respectively have been added. What is the total number of fruits kept for sale now?

A) 720 B) 600
C) 580 D) 820
 
Answer & Explanation Answer: A) 720

Explanation:
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0 178
Q:

125 - 73 + 48 - 137 + 99 = ?

A) 237 B) 62
C) -37 D) 52
 
Answer & Explanation Answer: B) 62

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1 203
Q:

If the value of θ = 30°, then the value of tan2θ + cot2θ.

 

A) 1/3 B) 4/3
C) 9/3 D) 10/3
 
Answer & Explanation Answer: D) 10/3

Explanation:
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1 4387
Q:

If the equations 6x - 5y + 11 = 0 and 15x +  ky - 9 = 0 have no solution, then the value of k is:

 

A) -18 B) 12.5
C) -12.5 D) 18
 
Answer & Explanation Answer: C) -12.5

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1 361
Q:

If Sin4A - Cos4A = 1 then (A/2) in degrees is 0° < A  90°

 

A) 60 B) 45
C) 40 D) 30
 
Answer & Explanation Answer: B) 45

Explanation:
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1 292