Question 60
If a nine-digit number 985x3678y is divisible by 72. then the value of (4x — 3y) is:
Solution
985x3678y 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
4x - 3y = 4 $$\times$$ 4 - 3$$\times$$ 4 = 4
So , the answer would be option b)4.
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