61
Q:

If × stands for 'addition', ÷ stands for 'subtraction', + stands for 'multiplication' and-stands for 'division', then 20 × 8 ÷ 8 - 4 + 2 = ?

A) 80 B) 25
C) 24 D) 5

Answer:   C) 24

Explanation:

By the Given data , We have the expression:

20 + 8 - 8 ÷ 4 × 2 = 20 + 8 - 2 × 2 = 20 + 8 - 4 = 24.

Q:

A sum of Rs.1890 has to be used to give 9 prizes to the customers of a super market for their overall academic purchases. If each prize is Rs.30 less than its preceding price, what is the least value of the price ?

A) 90 B) 95
C) 85 D) 80
 
Answer & Explanation Answer: A) 90

Explanation:

Let the least value of the prize = Rs. x
Then the next value of the prize is x+30 , x+60, x+90, ....x+240.
Given total amount of cash prizes = Rs.1890
 x + (x+30) + (x+60) + (x+90) + ....+ (x+240) = 1890
   9x + (30 + 60 + 90 + 120 + 150 + 180 + 210 + 240) = 1890
   9x + 30(1 + 2 + 3 + 4....+ 8) = 1890
   9x + 30(36) = 1890
  9x = 810  x=90
Hence the least value of the prize x=90

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6 41
Q:

12:30 :: 14: ?

A) 36 B) 28
C) 35 D) 42
 
Answer & Explanation Answer: C) 35

Explanation:

Here 12  2.5 = 30

In the same way 14  2.5 = 35

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10 44
Q:

In a group of buffaloes and ducks the number of legs are 24 more than twice the number of heads. What is the number of buffaloes in the group ? 

A) 6 B) 18
C) 12 D) 24
 
Answer & Explanation Answer: C) 12

Explanation:

Let the number of buffaloes be x

and number of ducks be y.

Now, number of heads = x+y

Number of legs = 4x+2y  .......(1)

But given that legs = 2(x+y)+24 ......(2)

solving (1) & (2),we get

4x+2y=2x+2y+24  2y=24  y=12   x=12.

Therefore number of buffaloes =12

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8 35
Q:

If A + B = 2C and C + D = 2A, then

A) A + C = B + D B) A + C = 2D
C) A + D = B + C D) A + C = 2B
 
Answer & Explanation Answer: A) A + C = B + D

Explanation:

Given,

A + B = 2C ----(i)

C + D = 2A----(ii)

Adding (i) and (ii) we get : A + B + C + D = 2C + 2A   B + D = A + C

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36 1564
Q:

Select the correct set of symbols which will fit in the given equation?

5  0  3  5 = 20

A) x, x, x B) -, +, x
C) x, +, x D) +, -, x
 
Answer & Explanation Answer: B) -, +, x

Explanation:

Clearly 5 - 0 + 3 X 5 = 20

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21 435