If in a certain coding language 'BROAD' is written as 'DBOAR', and 'BLOCK' is written as 'KBOCL', then how will 'CHAIN' be written in that coding language?

Given below are 2 statements and 2 conclusions. Take the statements to be true even if they are at variance with commonly known facts and decide whether the conclusion/s follow from the given statements.
Statements:
1. All plastics are fibers
2. Some fibers are metals
Conclusions:
I. Some plastics are metals
II. All metals are plastics

If in a certain coding language 'BROAD' is written as 'DBOAR', and 'BLOCK' is written as 'KBOCL', then how will 'CHAIN' be written in that coding language?

Select a figure that is similar to the figure given below in a certain manner.

In a batch of certain grade, there are 30 girls whose aggregate English marks are above 75%. If these constitute two-third of the girls and the total number of girls is three-fourths of the total number of students in the class, what is the number of boys in the class?