In a certain code language, 'FIG' is coded as 12, and 'PLUM' is coded as 20. How will 'GRAPES' be coded in that language?

Let's look at the connection between the number of letters or their positions and the final codes:
Word 1: FIG

Number of letters = 3

Let's check: 3×4=12

Word 2: PLUM

Number of letters = 4

Let's check: 4×5=20

The logic is: Number of letters×(Number of letters+1)

Let's test it for GRAPES:

Number of letters in GRAPES = 6

Applying the formula: 6×(6+1)=6×7=42