Question

If the number $CBA$ is divisible by 10, then $A$=

• A. $5$
• B. $0$
• C. $2$
• D. $8$

Answer 1

The correct option is B $0$

Expanding $CBA$, we have $CBA=100C+10B+A$
Since 100 is a multiple of 10, and thus, $100C$ is divisible by 10.
Similarly, 10 is a multiple of 10, and thus, $10B$ is divisible by 10.
Now if $A=0$, then $CBA=100C+10B=10(10C+B)$, divisible by 10.