If a nine digit number 389x6378y is divisible by 72, then the value of √(6x+7y) will be ?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 ie 8.
389x6378y divisible by 72
72 = 8 × 9
78y = y = 4
x + 12 = 18
x = 6
= √[(6 × 6) + (7 × 4)]
= √64 = 8