which greatest digit should replace m so that the number 778m09 is divisible by 3 ?
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Answer:
A number is divisible by 3, if the sum of
its all digits is a multiple of 3 or divisibility by 3.
Given number
778m09 is divisible by 3 when
(7 + 7 + 8 + m + 0 +9) = 31 + m is
divisible by 3.
33,36 and 39 are the number divisibile
by 3 and near to 31 + m.
We have to find the greatest digit
So if 31 + m = 39
m = 39 - 31
m = 8
8 is the greatest digit.
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