70% of 50 is 35 so the answer is 15
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You can get 18 wrong.
50 percent of 70 of a fraction = 35/150% of 70= 50% * 70= 50/100 * 70= 1/2* 70= 70/2 or 35/1
You can get 60 questions wrong, which leaves you with 140 answers correct, giving you 70%.
30
If you have 70% of something and 30% of another identical "something" that is equivalent to 50% of the two "somethings".