If a nine digit number 468x5138y is divisible by 72, then the value of √4x+3y is :
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Correct answer: D
Explanation
The correct answer is option 4 i.e. 6
9 digit number 468x5138y is divided by 72.
The number will be divisible by 8 and 9 both.
A number will be divisible by 8 if the last 3 digit of a number is divisible by 8.
38y will be divisible by 8 if y = 4.
A number will be divisible by 9 if the sum of the digits is divisible by 9.
468x51384 will be divisible by 9 if x = 6
√4x+3y = √[4(6) + 3(4)] = √(24 + 12) = √36 = 6