If a nine digit number 985 x 3678y is divisible by 72 then the value of 4x mdash 3y is ........

Quantitative Aptitude (CGL) Number System

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If a nine-digit number 985 x 3678y is divisible by 72. then the value of (4x — 3y) is:

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SSC CGL 4 June 2019 Shift-1

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Explanation:

985 x 3678y is divisible by 72 , so it is divisible by both 9 & 8.
Divisibility rule of 8 : Last 3 digits of a whole number should be divisible by 8.
So y = 4
Divisibility rule of 9 : Sum of all the digits in whole number should be divisible by 9.
Sum = 50 + x
x = 4
So , the answer would be option b)4.

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