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Integers — MATHS STD 7 — Question

Gujarat BoardEnglish MediumSTD 7MATHSIntegers1 Mark
Question
In a test $(+5)$ marks are given for every correct answer and $(–2)$ marks are given for every incorrect answer. Radhika answered all the questions and scored $30$ marks though she got $10$ correct answers.
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Answer

According to question,
Marks given for one correct answer $= 5$
So, marks given for $10$ correct answers$ = 5 \times 10 = 50$
Radhika’s score $= 30$
Marks obtained for incorrect answers $= 30 – 50 = – 20$
Marks given for one incorrect answer $= (–2)$
Therefore, number of incorrect answers$ = (–20) \div (–2) = 10$

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