In a certain code language,$REFRIGERATOR$ is coded as $ROTAREGIRFER$. Which word would be coded as $NOITINUMMA$?

The word $EXPAND$ has been written in four different codes by applying four different rules. $A$ word $TRAVELLER$ has been written in one of these codes. Identify the correct code for $TRAVELLER$ from the given options.
$EXPAND$ $(a)$ $FYQBOE$ $(b)$ $EPDTCR$ $(c)$ $GYRBPE$ $(d)$ $CWNZLC$
$TRAVELLER$ : ?

In a certain code,'$253$' means 'books are old','$546$' means 'man is old' and '$378$' means 'buy good books'. What stands for 'are' in that code?

In a certain code,$COMPUTER$ is written as $RFUVQNPC$. How is $MEDICINE$ written in the same code?

If in a certain code language,$TWENTY$ is written as $863985$ and $ELEVEN$ is written as $323039$,how will $TWELVE$ be written in that code?

If in a certain language $PORCELAIN$ is coded as $QOSCFLBJO$,which word is coded as $BKMOUSPP$?