Four-digit number

Find a four-digit number, which quadrupled written backward is the same number.

Correct answer:

x =  2178

Step-by-step explanation:

4 (abcd) = dcba 4 a=d  a1=1 d1=4 a1=4 1=4 a2=2 d2=4 a2=4 2=8  x=2178 a=4 x=4 2178=8712



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