Mysterious number

The magician thinks 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. This gives result 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 = 30

Our simple equation calculator calculates it.



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