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how to do a 3-well rounded

MY NUNBER IS DIVIDIBLE BY3, WHICH MEANS IT CAN BE DIVUDED BY 3 WITH NO REMAINDERS,AND YOURS IS NOT DIVISIBLE BY 3!" HOW DO YOU KNOW THAT WITHOUT DIVIDING IT?" WHEN I GET A NUMBER THAT 3 GOES INTO EVENLY,SO THAT MEANS MY NUMBER IS DIVIDED BY 3!" DAYCIA SAID, " SHE S RIGTH BECAUSE MY NUMBER HAPPENS  TO BE A THIRD OF MARYS NUMBER." JOEY SAID, MY MUMBER IS THE SUM OF MARYS AND  LUIS NUIMBERS.
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 Numbers are divisible by 3 , if and only if Sum of their digits are divisible by 3:
 
    27252 :   Sum of its digits are: 2+5+2+7 +2 = 18, therefore 27252 is divisible by 3
 
     27252÷ 3 = 9084  
 
    47987 : Sum  of the digits here is : 4+7+ 9 +8 +7 =35, therefore the number 47987 is not divisible by 3.
 
     47987 ÷ 3 = 15995 , remainder 2

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