Question

17. The difference between a three-digit number and the
number formed by reversing its digits is 198. Find the
difference of its first and last digits.

Answer 1

Answer:

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Step-by-step explanation:

Let the digits at unit place,10’s place and at 100’s place are z,y and x

then number =100x+10y+z

Number formed on reversing digits =100z+10y+x

Difference of these numbers=100x+10y+z-(100z+10y+x)=198

= 99x-99z =

99(x-z)=198

x-z=198/99=2

Thus x-z =2

Thus difference of first and last digit=2