alleryএটা পৰীক্ষাত প্ৰতিটো শুদ্ধ উত্তৰত +5 আৰু ভুল উত্তৰত −2 পোৱা যায়; 18 উত্তৰৰ নম্বৰ 55। শুদ্ধ গণনা?
A13
B15
C14
D12
Answer & Solution
Correct answer: A. 13
যদি c উত্তৰবোৰ শুদ্ধ হয়, তেন্তে 5c − 2(18 − c) = 55 7c = 91 আৰু c = 13।
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