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Let m be the number of minutes it takes Grandma to remove 30 weeds from her garden.
Since Grandma can remove 5 weeds per minute, in m minutes, she will remove 5m weeds.
Thus, the equation to represent this situation is 250 - 5m = 30.
To solve for m, subtract 250 from both sides of the equation to get -5m = -220.
Dividing both sides by -5 gives m = 44.
Therefore, it will take Grandma 44 minutes to remove all but 30 weeds from her garden.