Question 192900
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First, we get how many correct she got:
{{{0.78(150)=117}}}, number of correct questions.


Then, {{{150-117=red(33)}}}, number of mistakes (Answer)


Simply to check,


If 78% are correct, so the remaining 22% (100-78=22%) are incorrect:
{{{0.22(150)=33}}}, good


Thank you,
Jojo</font>