Whatever the number is, call it N, when we Divide N by 36 this means:
we can break N into some Integer Q number of groups of 36 ——where 27 will be left over unable to complete another group of 36
Thinking of each 1 Digit as 1 Block:
N will be broken up into Q groups of 36 Blocks:
(Group of 36 blocks)
(Group of 36 blocks)
(Group of 36 blocks)
..... etc
And 27 blocks will be on the Side, unable to complete another (Group of 36) blocks
If you visualize all the blocks scattered on the floor:
We can Sub-Divide EACH (Group of 36) Blocks into:
4 groups of 9 blocks each
And the 27 blocks that were left over can be Divided into 3 groups of 9 blocks each
Therefore, no matter how many groups of 36 blocks we can make (which following the Analogy would be the Quotient) ——- when there is 27 blocks left over (the Remainder)
The original number N will ALWAYS be Divisible by 9
-D-
Formalizing this logic into a Rule:
For every Unique Integer N, we can create an Equation when we divide that N by some Divisor
(N/36) = Q-quotient + (9/36)
N = 36 * Q + 9
—where Q = some Integer——-
The only answer choice that evenly divide the Right Hand Side of the Equation, regardless of the Value of Q, is 9
Thus, N must be Divisible by 9
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