In a competitive examination containing 200 questions, 2 marks are awarded for every correct answer and 1 mark gets deducted for every wrong answer. If a student attempted all questions and obtained 97 marks, how many wrong answers must he have given?
Let number of questions with right answers = x ∴ No. of questions with wrong answers = 200 –x ∴ Marks obtained for right answers = 2x ∴ Marks deducted for wrong answers = 200 -x ∴ 2x – (200-x) = 97 ⇒ 3x = 200 + 97 ⇒ 3x = 297 ∴ x= 99 ∴ No. of questions with wrong answers (200 – 99) = 101
Ergot is an important disease of:
Imperata cylindrica is propagated means of
Which of the following statements is/are true?
Statement A: Green manure refers to the practice of growing and incorporating specific crops into ...
Sprouting of Onion and Potatoes in storage can be avoided by using this as pre-harvesting treatment
Plant’s ability to chemically inhibit the growth of other plants is called
Which of the following dispersion measure is least affected by extreme values?
Where do grasshoppers lay eggs?
Meloidogyne incognita which causes stunting of gladiolus plants and their yellowing is:
Which among the following is a frost tolerant variety of raya
Azolla – Anabaena is a symbiotic association of