Find the area of a trapezium whose parallel sides are 12

What will come in place of ‘a’?      

In a certain code language ‘POTTER’ is written as ‘RSVXGV’. What will be the code for the ‘DANGER’ in the same language?

In a certain code language, GAMBLE is coded as PDEHOE, HAMPER is coded as PDKUHS. What is the code for FRANCE in that code language?

What is the code for “Unsettling conservative”?      

What will be the code for ‘S?33  Y?8  K&13’ in the given code language?

What is the code for the word  “guard” ?

The code “el” is coded as which of the following word?

In a certain code language, ‘STEM’ is written as ‘56’, and ‘BRAG’ is written as ‘27’. How will ‘GRIM’ be written in that language?