A number is doubled and 9 is added. If the resultant is trebled, it beomes 75. What is that number?
A
None of these
B
6
C
8
D
3.5
Correct Answer: 8
ধরি, সংখ্যাটি x ( 2x + 9) × 3 = 75 2x + 9 = 25 2x = 16 x = 8