Question

If 21x7 is divisible by 9, then which digit can replace the letter x in the 4-digit number 21x7?​

Answer 1

$\huge\bold \red{solution}$

The sum of the digits of 21x7 is 2+1+x+7 = 10 + x .

21x7 is divisible by 9, therefore, 10+x should be divisible by 9 .

Hence , 10+x should be 18, i.e.,

$\huge \bold \red{x = 8}$

Answer 2

Answer:

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