If the 9 -digit number 89x64287y is divisible by 72, then what is the value of (3x + 2y) ?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 28
89x64287y
87y is divisible by 8 ( divisiblility rule of 8 last three digits divisible by 8 then no. is divisible by 8 )
y = 2
8 + 9 + x + 6 + 4 + 2 + 8 + 7 + 2 = 46 + x
x = 8
3x + 2y = 3 × 8 + 2 × 2 = 24 + 4 = 28