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24%. If this is math homework, come on... Its not that hard

If the percentage he got right (19 / 25 = 76%) is 76%

Then the percentage he got wrong would be the number of answers he got wrong subtracted from the total amount of answers (25 - 19 = 6), 6.

Divide 6 by 25 (which if you got all 25 right you would have 100%) to find the percentage (6 / 25 = 24%)

Answer: Edward got 24% wrong

24% wrong. Use the proportion of 19/25=x/100 and solve for x. The answer is 76. So, he got 76% right. Then subtract that from 100 to get 24.

He got 24% wrong