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Shyam KoppoJu

· started a discussion

· 1 Months ago

Dear Knowledge Expert, Difference is for no.s but not for the digits of 2 digit no.s (Question: 126690.0 )

So...Option D satisfies both the condns

Question:

If the places of last two digit of a three digit number are interchanged,a new number greater than the the original number by 54 is obtained.What is the difference between the last two digits of a number?

Options:
A)

9

B)

12

C)

6

D)

Data inadequate

E)

None of these

Solution:
Ans(c):

Let the three digit number be 100x+10y+z.

According to the question,

(100x+10z+y)-(100x+10y+z)=54

9z-9y=54

z-y=6

Knowledge Expert

· commented

· 1 Months ago

Ans: (e) Can’t be determined
let two numbers viz. x and y in which x be on ten's place and y on unit place.

so number = 10x+y

on reversing digit,

new number = 10y+x

Given,

x-y = 18 _________(1)

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

x-y = 2 ________(2)

There is no solution of two similar linear equations.
Given answer is correct.
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