In a regular week, there are 5 working days and for each day, the working hours are 8. A man gets Rs. 2.40 per hour for regular work and Rs. 3.20 per hours for overtime. If he earns Rs. 432 in 4 weeks, then how many hours does he work for ?

Correct Answer: None of these

Explanation:

After solving we get,

 

62/931.

 

None of the options satisfy.

Correct Answer: 35 litres

Explanation:

Let the capacity of the tank be x litres.

 

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

Correct Answer: 62.5

Correct Answer: 105/304

Explanation:

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

Correct Answer: 50

Explanation:

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

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

Correct Answer: 300

Explanation:

37 1 2 = 75 2

Required number =   75 2 1 8 = 75 x 4 = 300

Correct Answer: 200

Explanation:

Let the number  of 20 paise coins be x. Then the no of 25 paise coins = (324 - x).

0.20 * (x) + 0.25 (324 - x) = 71 => x = 200..

Correct Answer: 10

Explanation:

Apply  a 3 + b 3 + c 3 - 3 a b c a 2 + b 2 + c 2 - a b - b c - c a = a + b + c

 

Hence the answer is  1.5 + 4.7 + 3.8 = 10.

Correct Answer: 121

Explanation:

Let the score be x. Then the highest score = 3x/11.

Reminder = (x - 3x/11) = 8x/11 .Next the highest score = 3/11 of 8x/11 = 24x/121.

3x/11 - 24x/11 = 9 <=> 33x - 24x = 9*121 <=> x= 121..

Correct Answer: 166252

Explanation:

Given  9261 3 x 62742241 = ? + 89

 

Using unit digit method,

 

On LHS,

 

1 x 1 x 1 = 1

 

sqrt of last digit 1 => it must end with either 9 or 1

 

so now

 

1 x 1 = 1

 

1 x 9 = 9

 

On RHS,

 

? + 89

 

=> ? = ...1 - 89 = last digit is 11- 9 = 2

 

or

 

=> ? = ...9 - 89 = last digit is 9 - 9 = 0

 

Here in the options last digit 2 is option C.