Question 386792
If you got 70% right, that means you got 30% WRONG.  
You need to find 30% of 190.  Solve the proportion:
{{{30/100 = x/190}}} (percent out of 100 = is over of)(30% OF 190 IS x)
{{{5700=100x}}}
{{{57 = x}}}
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Therefore you missed 57 questions. 
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You could also change 30% to a decimal and multiply by 190:
{{{.3 * 190 = 57}}}