Question

2. If 31y4 is a multiple of 6, where y is a digit, what might be the value of y?
3. If 4122 is a multiple of 6, where z is a digit, what might be the value of z?
4. If 31x26 is a multiple of 6, where x is a digit, what might be the value of x?​

Answer 1

Answer:

a.) 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

Step-by-step explanation:

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