csatmedium
P scored 40 marks more than Q in an examination. If Q scored 10% less marks than P, then how much did Q score?
- A.360
- B.380
- C.400
- D.420
▶ Answer & Explanation
Correct answer: A. 360
Let P's score be x. Then Q's score is x - 40. According to the question, Q scored 10% less than P, which means Q's score is 90% of P's score. So, Q's score = 0.90 * P's score. Substituting the values, x - 40 = 0.90x. Solving for x, we get 0.10x = 40, so x = 400. Therefore, Q's score is 0.90 * 400 = 360.
Source: UPSC csat 2021