If 24y5 is a multiple of 9, find all possible values of y.
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If 24y5 is a multiple of 9, find all possible values of y.
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Answer:
1
Step-by-step explanation:
Since the number 21y5 is a multiple of 9.
So, the sum of its digits 2+1+y+5=8+y is a multiple of 9.
∴(8+y) is either 0 or 9 or 18 or ...
Since y is a digit, so (8+y) must be equal to 9.
i.e., 8+y=9
⇒y=9−8=1
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