Question

abc is a three digit number and a - c = 0. This three digit number is reversed and subtracted from the original number. The difference obtained is _________

• A. 11
• B. 9
• C. 99
• D. 0.0

Answer 1

The correct option is D 0.0

Given: abc is a 3-digit number and a - c = 0

General form of abc = 100a + 10b + c ... (i)

Number obtained by reversing the digits is cba.

General form of cab = 100c + 10b + a ... (ii)

Subtracting (ii) from (i)
$(100a+10b+c)-(100c+10b+a)$
$=(100-1)a+(10-10)b+(1-100)c$
$=99a-99c$
$=99(a-c)$
$=0$ (Since a - c = 0)

Therefore, the difference abc - cba = 0.