Q. The letters from A to Z are numbered from 1 to 26 respectively. If GHI = 1578 and DEF = 912, then what is ABC equal to?

Explanation : 

ghi=1578 def=912 abc= ?

ALPHABETS TO NUMBERS:
ABC = 123
DEF = 456
GHI = 789

DOUBLING THE NUMBERS:
ABC: 123 × 2 = 246
DEF: 456 × 2 = 912
GHI: 789 × 2 = 1578

Pattern: Each three-letter group when doubled gives the result shown on the right side.