Devon's Burgers cooks its burgers either well done or medium. The restaurant served 30 burgers last night, 30% of which were well done. How many well-done burgers did the restaurant serve?

9 well-done burgers

Step-by-step explanation:

30 times 30% equals 9

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step-by-step explanation:

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x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x