20×3 is a multiple of 3 if the digits × is _______ or _______ or ________
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Step-by-step explanation:
A number is divisible by 3 if the sum of its digits is also divisible by 3
Therefore, 2+0+x+3= is multiple of 3
x+5=6,9,12, for other multiples of 3, x becomes negative or double digit.
x=1,4 or 7
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