CAPF (AC) 2019 (Paper-1) (Question 101-125)

S.P. of article = 27000

Loss % = 10%

∴ C.P. of article = (2700×100)/90 = ₹3000

If he sells it for 3600.

Then, gain percent

= (3600-3000)/3000 × 100

= 600/3000 × 100 = 20%

The pattern of the series is as :

2940 = 2 × 2 × 5 × 7 × 7 × 3
So, if we multiplied with 15, then it will become a perfect square.

Let the two digit number is 10x + y

When reverse the digits, 10y + x

According to the question,

10y + x - (10x + y) = 27

⇒ 10y + x - 10x - y = 27

⇒ 9(y - x) = 27

⇒ (y - x) = 3

If y = 4, then x = 1

⇒ Two-digit number will be 41.

If y = 5 then x = 2

⇒ Two-digit number will be 52.

If y = 6 then x = 3

⇒ Two-digit number will be 63

If y = 7 then x = 4

⇒ Two-digit number will be 74.

If y = 8 then x = 5

⇒ Two-digit number will be 85.

If y = 9 then x = 6

⇒ Two-digit number will be 96.

∴ Sum of such two digits

= 41 + 52 + 63 + 74 + 85 + 96 = 411

The pattern is as :

5 + 4 + 7 + 2 = 18 ⇒ 1 + 8 = 9

6 + 3 + 4 + 2 = 15 ⇒ 1 + 5 = 6

7 + 5 + 8 + 4 = 24 ⇒ 2 + 4 = 6

Similarly

9 + 2 + 3 + 6 = 20 ⇒ 2 + 0 = 2

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• have special knowledge of economics.

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