808/HK14. problem / Math - Solved Math Problems

MR-808 / 7. problem

What number can stand in the place of X in the five-digit number 2582X , if the number is divisible by 3?
Explain the answer!

A number is divisible by 3 if the sum of its digits is divisible by 3.

$2 + 5 + 8 + 2 + 0 = 17$

$2 + 5 + 8 + 2 + 1 = 18$

$2 + 5 + 8 + 2 + 2 = 19$

$2 + 5 + 8 + 2 + 3 = 20$

$2 + 5 + 8 + 2 + 4 = 21$

$2 + 5 + 8 + 2 + 5 = 22$

$2 + 5 + 8 + 2 + 6 = 23$

$2 + 5 + 8 + 2 + 7 = 24$

$2 + 5 + 8 + 2 + 8 = 25$

$2 + 5 + 8 + 2 + 9 = 25$

$1; 4; 7$

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