117
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:   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

Q:

What is

 A) 0 B) 42 C) 50 D) 57

Answer & Explanation Answer: C) 50

Explanation:

Given 7 + 7/7 + 7 x 7 - 7

By using BODMAS rule,

7 + 1 + 7 x 7 - 7

= 8 + 49 - 7

= 57 - 7

= 50.

Hence 7 + 7/7 + 7 x 7 - 7 = 50.

Report Error

1 69
Q:

Find the Value of ?

 A) 81 B) 77 C) 73 D) 89

Answer & Explanation Answer: D) 89

Explanation:

This can be done in a method called Approximation.

Now,

Report Error

5 142
Q:

Can you Solve  =

 A) 112 B) 56 C) 0 D) 98

Answer & Explanation Answer: A) 112

Explanation:

Report Error

7 141
Q:

The last two digits of ${\mathbf{2151}}^{\mathbf{415}}$?

 A) 81 B) 61 C) 91 D) 51

Answer & Explanation Answer: D) 51

Explanation:

Unit digit of this expression is always 1 as the base ends with 1.

For the tenth place digit we need to multiply the digit in the tenth place of the base and unit digit of the power and take its unit digit.

i.e, tenth place digit in 2151 is 5 and

tenth place digit in power 415 is 1

And the units digit in the product of 5 x 1 = 5

Therefore, last two digits of ${\mathbf{2151}}^{\mathbf{415}}$ is 51.

Report Error

4 229
Q:

What is the value of P in the following Equation ?

 A) 3.9 B) 4.1 C) 3.7 D) 4.5

Answer & Explanation Answer: D) 4.5

Explanation:

Given equation is

Here it is in the form of

Here m = 2.5 , n = p, m+n = 7

=> 2.5 + p = 7

=> p = 7 - 2.5

=> p = 4.5

Report Error

8 339
Q:

The solution of 3(2u + v) = 7 uv and 3(u + 3v) = 11 uv is _____

 A) u = 1, v = 0 B) u = 1, v = 3/2 C) u = 0, v = 3/4 D) u = 0, v = 1

Answer & Explanation Answer: B) u = 1, v = 3/2

Explanation:

Using Trial and error method,

From the options  u = 1, v = 3/2 satisfies both the equations.

Report Error

16 367
Q:

What approximate value will come in place of question mark (?) in the following question ?

(49.001)2  = ?

 A) 2500 B) 2400 C) 2600 D) 2300

Answer & Explanation Answer: B) 2400

Explanation:

Given (49.001)2  = ?

=> =~ 49 x 49

=~ 2401

=~ 2400

Report Error

12 451
Q:

Find the quadratic equations whose roots are the reciprocals of the roots of $2{x}^{2}+5x+3$?

A)  $3{x}^{2}+5x+2=0$

B) $5{x}^{2}+3x+2=0$

C) $3{x}^{2}-5x-2=0$

D)  None

 A) A B) B C) C D) D

Answer & Explanation Answer: A) A

Explanation:

The quadratic equation whose roots are reciprocal of $2{x}^{2}+5x+3=0$ can be obtained by replacing x by 1/x.

Hence, 2(1/x)(1/x)+ 5(1/x) + 3 = 0

=> $3{x}^{2}+5x+2=0$

Report Error

4 881