In a certain code language 'WHEAT' is written as 'AMIFX' and 'BLACK' is written as 'FQEHO'. How will 'GREASE' be written in the same code language?

Let's find the logical pattern between the words and their codes.
Word: WHEAT
Code: AMIFX

Let's look at the positional changes (reversing the letter sequence or cross pattern shifts):

W
+4

​
A (since 23+4=27≡1=A)

H
+5

​
M (8+5=13=M)

E
+4

​
I (5+4=9=I)

A
+5

​
F (1+5=6=F)

T
+4

​
X (20+4=24=X)

So, the pattern is an alternating addition of +4,+5,+4,+5,+4 to the respective letter positions.

Let's verify with BLACK:

B
+4

​
F (2+4=6)

L
+5

​
Q (12+5=17)

A
+4

​
E (1+4=5)

C
+5

​
H (3+5=8)

K
+4

​
O (11+4=15)
This matches FQEHO.

Now, applying this pattern to GREASE:

G+4=7+4=11→K

R+5=18+5=23→W

E+4=5+4=9→I

A+5=1+5=6→F

S+4=19+4=23→W

E+5=5+5=10→J

Hence, the code for GREASE is KWIFWJ.