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?

Result

x =  30

Solution:


x/(-5) / 3 * 10/(-4) = 5

0.5x = 15

x = 30

Calculated by our simple equation calculator.








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To solve this example are needed these knowledge from mathematics:

Do you have a linear equation or system of equations and looking for its solution? Or do you have quadratic equation?

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