Question

If 42x5 is a multiple of 3, where × is a digit , what is the value of x.​

Answer 1

Answer:

is a multiple of 9 where x is a digit. · For a number to be divisible by, the sum of the digits should be = 9. · So 4+2+x+5 = 11+x = 2+x. · So if 2+x=9,

Answer 2

The multiples of 9 have the sum of their digits equal to the multiples of 9 so:

4+2+x+5=11+x

x=7

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