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snow_lady [41]
3 years ago
6

I thought of a 2-digit number. It's a multiple of 9 and the sum of its digits is five times smaller than the number itself. What

is my number?
Mathematics
1 answer:
erma4kov [3.2K]3 years ago
7 0

Step-by-step explanation:

Since the sum of the digits must be an integer, the number itself must also be a multiple of 5.

Lowest common multiple of 5 and 9 = 45.

Therefore the number could be 45 or 90.

5(9 + 0) =/= 90, so 90 is incorrect.

Since 5(4 + 5) = 45, 45 is the answer.

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