91
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

Explanation:

By the Given data , We have the expression:

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

Q:

What is the value of P in the following Equation ?

$\fn_jvn \left ( 19 \right )^{2.5}x\left ( 19 \right )^{p}=\left ( 19 \right )^{7}$

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

Explanation:

Given euation is

$\fn_jvn \left ( 19 \right )^{2.5}x\left ( 19 \right )^{p}=\left ( 19 \right )^{7}$

Here it is in the form of $\fn_jvn a^{m}xa^{n} = a^{\left ( m+n \right )}$

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

=> 2.5 + p = 7

=> p = 7 - 2.5

=> p = 4.5

5 85
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

Explanation:

Using Trial and error method,

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

14 141
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

Explanation:

Given (49.001)2  = ?

=> =~ 49 x 49

=~ 2401

=~ 2400

11 248
Q:

Find the quadratic equations whose roots are the reciprocals of the roots of $\inline \fn_jvn \small 2x^{2}+5x+3=0$ ?

A)  $\fn_jvn \small 3x^{2}+5x+2=0$    B) $\fn_jvn \small 5x^{2}+3x+2 = 0$     C) $\fn_jvn \small 3x^{2}-5x-2=0$   D)  None

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

Explanation:

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

Hence, 2$\inline \fn_jvn \small \left ( \frac{1}{x}\right )^ {2}$ + 5(1/x) + 3 = 0

=> $\fn_jvn \small 3x^{2}+5x+2=0$

4 604
Q:

What should come in place of the question mark(?) in the following questions ?

$\inline \fn_jvn \small 3\tfrac{1}{6}+4\tfrac{1}{2}-2\tfrac{2}{3}-1\tfrac{11}{12}=?$

 A) 1 7/12 B) 1 5/12 C) 3 7/12 D) 3 1/12