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Sum
5 × 555 a multiple of 9?
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Solution
Sum of the digits of 5 × 555
= 5 + x + 5 + 5 + 5 = 20 + x
It is multiple by 9
The sum should be divisible by 9
Value of x will be 7
Concept: Tests for Divisibility of Numbers - Divisibility by 3
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