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Q:

# Today is Varun's birthday. One year, from today he will be twice as old as he was 12 years ago. How old is Varun today ?

 A) 20 years B) 22 years C) 25 years D) 27 years

Answer:   C) 25 years

Explanation:

Let Varun's age today = x years.

Then, Varun's age after 1 year = (x + 1) years.

Therefore x + 1 = 2 (x - 12) $\inline \Rightarrow$ x + 1 = 2x - 24 $\inline \Rightarrow$ x = 25.

Q:

Rajitha has a calculator, which has 10 digits. She want to clean the calculator by removing all the keys and while reassembling it, she interchanged the locations of 3 pairs of keys. For example, if she placed the key ‘3’ in the place of the key ‘7’, she placed the key ‘7’ only in the place of the key ‘3’ and not any other key. All keys that were interchanged corresponded only to numbers. Later, she input some calculations and obtained outputs as provided in the table below. The input is shown in terms of the keys that Kavitapressed, while the output is the output displayed by the calculator.

Output:

1.   95 + 84=128
2.   128 + 64=195
3.   912 + 43=942
4.   178 + 19=192

Question :

Which of the following pair of digits is unchanged ?

 A) 9, 0, 3 B) 1, 3, 8 C) 7, 0, 1 D) 2, 4, 1

Answer & Explanation Answer: C) 7, 0, 1

Explanation:
 0 1 2 3 4 5 6 7 8 9 0 1 4 8 2 6 5 7 3 9

Here pairs interchanged are

2, 4

3, 8

5, 6

Unchanged are 0, 1, 7, 9

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4 107
Q:

What is the difference between the local values of 3 in the number 43403 ?

 A) 0 B) 3030 C) 3003 D) 2997

Answer & Explanation Answer: D) 2997

Explanation:

3000 – 3 = 2997

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6 144
Q:

Find the least number by which 175760 be divided to make it a perfect cube.

 A) 6 B) 10 C) 9 D) 30

Answer & Explanation Answer: B) 10

Explanation:

175760 =2³ x 2 x 5 x 13³
= 2³ x 2 x 5 x 13³

To make perfect cube, it must be divided by 2 x 5 = 10

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2 206
Q:

The sum of three consecutive multiples of 3 is 72. What is the second largest number ?

 A) 27 B) 24 C) 21 D) 42

Answer & Explanation Answer: B) 24

Explanation:

Let the numbers be 3x, 3x + 3 and 3x + 6.
Then,
3x + (3x + 3) + (3x + 6) = 72
9x = 63
x = 7
Largest number = 3x + 6 = 27.

=> Second largest number = 27 - 3 = 24

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1 336
Q:

When 5% is lost in grinding Maize, a country has to import 20 million bags; but when only 2% is lost, it has to import only 15 million bags. Find the quantity of Maize, which grows in the country ?

 A) 188 million B) 166 2/3 million C) 192 3/4 million D) None

Answer & Explanation Answer: B) 166 2/3 million

Explanation:

5% - 2% = 3%
=> 3% ------ 5 million bags
100% ---- ?
=> 166 2/3 million bags.

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