Question 72

If the number 687x29 is divisible by 9, then the value of 2x is:

Solution

Divisibility rule by 9, if the sum of all number is divisible by 9 then number is divisible by 9.

Sum of number = 6 + 8 + 7 + x + 2 + 9 = 32 + x

putting the value of x = 4

32 + 4 = 36 divisible by 9 so,

zx = 2 $$\times$$ 4 = 8

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