A number Y is divisible by 18. Find other numbers by which given number Y is completely divisible. 
Given number Y is divisible by 18, so firstly find the factors of 18:
Factors of 18 = 1, 2, 3, 6, 9 & 18
Now number 'Y' will also be divisible by 1, 2, 3, 4 & 9 because if a given number is divisible by another number, then the given number will also be divisible by all the factors of another number.
Therefore, other numbers by which number Y is completely divisible are 1, 2, 3, 6 & 9 
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A number 'X' is divisible by 7 and 8. Find another number which completely divides the number 'X'. 
A number Y is divisible by 18. Find other numbers by which given number Y is completely divisible. 
