Let the number of correct answers be X.

Number of incorrect answers = (60 ? X).

4x ? (60 ? x) = 130

=> 5x = 190 

=> x = 38

Let the cost of a table and that of a chair be Rs. x and Rs, y respectively.

Then, 2x + 3y = 3500 ...(i)

and 3x + 2y = 4000 .....(ii)

solving (i) and (ii) we get x = 1000, y = 500 

Let the no of shots be x. Then, 

Shots fired by A =(5/8)x

Shots fired by B = (3/8)x 

Killing shots by A = 1/3 of (5/8)x  = (5/24)x

Shots missed by B = 1/2 of (3/8)x = (3/16)x 

(3/16)x = 27  ? x =144

Birds killed by A = (5/24)x = (5/24)*144 = 30

3 * 5 + 5 * 3 = (2 * 3 - 3 * 5 + 3 * 5) + ( 2 * 5 - 3 * 3 + 5 * 3)

                    = (6 + 10 - 9 + 15) = 22.

a + b + c 2 = a 2 + b 2 + c 2 + 2 a b + b c + c a

$$\begin{gathered} 2 a b + b c + c a = a + b + c 2 - a 2 + b 2 + c 2 \\ = 169 - 69 = 100 \\ = a b + b c + c a = 50 \end{gathered}$$

Required difference = 19/16 - 16/19  =  105/304..

Let the capacity of the tank be x litres.

Then, (6x/7 - 2x/5) = 16 <=> 30x - 14x = 16*35 <=> x = 35

After solving we get,

62/931.

None of the options satisfy.

Suppose the man works overtime for x hours.

Now, working hours in 4 weeks = (5 x 8 x 4) = 160.

Therefore,  160 * 2.40 + x * 3.20 = 432

 => 3.20x = 432 - 384 = 48

 => x = 15.

 Hence, total hours of work = (160 + 15) = 175.