Mysterious number

The magician thinks of the number: "The mysterious number is first divided by minus five, dividing the result by three, multiplying the number by ten, and dividing the resulting number by minus four. The result is 5.
Can you reveal the mysterious number?

Correct answer:

x =  30

Step-by-step explanation:


x/(-5) / 3 · 10/(-4) = 5

0.5x = 15


x = 15/0.5 = 30

x = 30

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