Please those who know the answer, they only solve because I want correct answer. Please its important a) What is the smallest whole number that is equal to seven times the sum of its digits?
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21
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What is the smallest whole number that is equal to seven times the sum of its digits? Answer: The answer to this math riddle is 21.
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Answer:
21
Number is 10x + y where x is tens digit and y is ones digit
According to the question
10x+y= 7 (x+y)
10x +y= 7x + 7y
10x-7x = 7y- y
3x = 6y
x = 2y
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