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A,B, C and D are single-digit numbers. The following equations can all be made with these numbers.
A + C = D
A x B = C
C - B = B
A x 4 = D
Find the vlaues of each digit and input your answer as a four digit-number, ABCD.
Too bad! Pay close attention to the equations and the answer will become clear.
That's right! ABCD = 2368.
Since A + C and A x 4 both equal D, then C must equal A x 3. If C - B = B, then C must also equal B x 2. The only single-digit number divisible by both 2 and 3 is 6. Once you know that C = 6, the rest is easy.
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