The sum of two digits of a number is 10. If the digits are interchanged, then its value increases by 18. Find the number.

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RRB Non Technical Exam (Secunderabad) 2016 click here to view all questions

The sum of two digits of a number is 10. If the digits are interchanged, then its value increases by 18. Find the number.

A46

B64

C19

D28

rahim ? Jan 10 '2020 at 12:0

Correct answer is: 46

Explanation:

Let us assume the digits are x and y, so the number is written as "xy".

Sum of digits is 10, so

x + y = 10 ..........................(1)

as x is in 10s' place and y in units place the actual number is 10*x + y

when the digits are interchange (i.e number written as "yx") the actual number becomes 10*y+x

Given that interchanging increases the value by 18, so

(10*y+x) - (10*x + y) = 18

i.e 9*y - 9*x = 18

i.e y - x = 2 ............................. (2)

Adding (1) and (2) we get

2*y = 12

or y =6

Putting y = 6 in (1)

x + 6 = 10

or x =4

So the number is 10*x + y

i .e 10 * 4 + 6

or 46

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What smallest number should be added to the sum of squares of 15 and 14, so that the resulting number is a perfect square?

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RRB Non Technical Exam (Secunderabad) 2016 click here to view all questions

What smallest number should be added to the sum of squares of 15 and 14, so that the resulting number is a perfect square?

A17

B20

C11

D9

No answer description available for this question. Let us discuss.

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4/5 of a certain number is 64.half of the number is?

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RRB ASSISTANT LOCO PILOT (Patna) 2013 click here to view all questions

4/5 of a certain number is 64.half of the number is?

A40

B32

C80

D16

rahul ? Jan 15 '2020 at 9:12

Correct answer is: 40

Explanation:

Let the number be x

Therefore,
\(\frac{4x}{5} = 64\)
4x = 320
x = 80

Hence, \(\frac{1}{2} \)of the number = \(\frac{1}{2} \times 80 \)= 40

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If each of the digits in the number '92581473' are arranged in ascending order, what will be the difference between the digits, which are fourth from the right and third from the left in the new arrangement?

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RRB ASSISTANT LOCO PILOT (Patna) 2013 click here to view all questions

If each of the digits in the number '92581473' are arranged in ascending order, what will be the difference between the digits, which are fourth from the right and third from the left in the new arrangement?

AOne

BTwo

CThree

DFour

rahul ? Jan 15 '2020 at 15:22

Correct answer is: Two

Explanation:

Ascending order 1 2 3 4 5 7 8 9
∴ Required difference = 5 - 3 = 2

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Find the digit in the unit's place for the following

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KPTCL Assistant Exam (Mescom) SLOT1 2017 click here to view all questions

Find the digit in the unit's place for the following:
$$(124)^{112} + (124)^{143}$$

A1

B6

C4

D0

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