alleryएक परीक्षण प्रत्येक सही उत्तर पर +5 और गलत उत्तर पर −2 देता है; 18 उत्तर स्कोर 55. सही गिनती?
A13
B15
C14
D12
Answer & Solution
Correct answer: A. 13
यदि c के उत्तर सही हैं, 5c − 2(18 − c) = 55 7c = देता है
91 और c = 13.
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