In a test (+4) marks are given for every correct answer, (−2) marks are given for every incorrect answer and 0 marks for not attempting the question. Laasya scored 20 marks. If she has got 12 correct answers, how many questions has she attempted incorrectly?
Answers
Answer:
The current velocity of a river grows in proportion to the distance from its bank and reaches the maximum value v in the middle. Near the banks the velocity is zero. A boat is moving along the river in such a manner that it is always perpendicular to current and the speed of the boat in still water is u. If the width of river is , the distance through which the boat crossing the river will be carried away by the current is lwo then the value of b is:
Answer:
5,9
Step-by-step explanation:
Case 1: Asha scored =26 marks
Correct answer by Asha =9
Let incorrect answers by Asha be x
According to question, 9(4)+x(−2)=26
−2x=26−36
⇒x=5.
Incorrect answers by Asha =5
Case 2: Varun scored =2 marks
Correct answers by Varun =5
Let incorrect answers by Varun be y
According to question, we have
5(4)+y(−2)=2⇒−2y=2−20⇒y=9
Incorrect answers by Varun =9.