Simplify 1.53 + 4.73 + 3.83 - 3 x 1.5 x 4.7 x 3.81.52 + 4.72 + 3.82 - 1.5 x 4.7 - 4.7 x 3.8 - 1.5 x 3.8

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: 300

Explanation:

37 1 2 = 75 2

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

Correct Answer: 175

Explanation:

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.

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: 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.

Correct Answer: 70000

Explanation:

$$\begin{gathered} 112 × 5 4 \\ 112 × 10 2 4 \\ = 112 × 10000 2 4 \\ = 1120000 / 16 \end{gathered}$$

= 70,000.

Correct Answer: 12

Explanation:

Let the number of buffaoes be x and number of ducks be y.

Then 4x + 2y = 2(x + y) + 24  

=> 2x = 24

=> x = 12.

Correct Answer: 1134

Explanation:

$$\begin{gathered} 1 3 x ? + 4 7 x 11 4 x 539 = 31 100 x 2000 \\ ? = 378 x 3 \\ ? = 1134 \end{gathered}$$