It was 21st May ~ 521 (part 1)
Algebra
Level
2
What is the value of the 4-digit number satisfying the above condition?
The answer is 3125.
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1 solution
Let x = A B C D ⇒ 1 A B C D = 1 0 0 0 0 + x
1 0 0 0 0 + x x = 2 1 5
2 1 x = 5 ( 1 0 0 0 0 + x )
1 6 x = 5 0 0 0 0
x = 3 1 2 5