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Step-by-step explanation:
so, there were in total 63 + 7 = 70 questions.
therefore,
100% = 70
1% = 100%/100 = 70/100 = 0.7
to know how many % are the 63 correct answers we need to divide 63 by 1% :
63 / 0.7 = 90%
so, he got 90% correct.