72
Q:

# If × means ÷,  - means ×,  ÷ means + and  + means- than (3 - 15 ÷ 19) × 8 + 6 = ?

 A) 8 B) 4 C) 2 D) -1

Explanation:

By the given data, we have  the expression :

(3 × 15 + 19) ÷ 8 - 6 = (45 + 19) ÷ 8 - 6 = 64 ÷ 8 - 6 = 8 - 6 = 2

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.

13 84
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

11 208
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

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

4 494
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

Answer & Explanation Answer: D) 3 1/12

Explanation:

? = (3 + 4 - 2 - 1) + ( 1/6 + 1/2 - 2/3 - 11/12)

= 4 + ((2+6-8-11)/12)

= 4 - 11/12 = 3 1/12.

12 481
Q:

In a cricket match, five batsmen P, Q, R, S and T scored an average of 36 runs. S Scored 5 more than T; T scored 8 fewer than P; Q scored as many as S and T combined; and Q and R scored 107 between them. How many runs did T score ?

 A) 20 B) 29 C) 28 D) 24

Explanation:

Let the runs scored by P, Q, R, S and T be  a, b, c, d and e

From given data,

a + b + c + d + e = 36 x 5 = 180
b + c = 107
Let a = x
e = x-8
d = x-3
now 3x - 11 + 107 = 180
3x = 84
x = 28
e's score = 28-8 = 20