A shopkeeper earns a profit of ₹2 by selling a pen and incurs a loss of 50 paise per pencil and loss of 15 paise per eraser while selling pencils and erasers of old stock. On a particular day, he earns a profit of ₹10. If he sold 10 pens and the number of pencils and erasers he sold are in the ratio 7/10 then the number of pencils and erasers he sold on the day is:
In a competition 3 marks are given for every correct answer and (-2) marks are given for every incorrect answer and no marks for not attempting any question. Sachin scored 24 marks. If he got 14 correct answers, how many questions has he attempted incorrectly?