Synopsis IAS

Answer

Solution

UPSC Prelims

Mathematics

Theme:

Percentage / प्रतिशत

Q34 2019, Percentage

In an examination, A has scored 20 marks more than B. If B has scored 5% less marks than A, how much has B scored?

• We check with options directly.

• Start with (a). If B is 360, A will be 380. Now, 5% of 380 = 19. So B will become 380 – 19 = 361. Hence this option is wrong (B is 360, not 361).

• If B is 380, A will be 400. Now, 5% of 400 = 20. So B will be 400 – 20 = 380. Hence (b) is correct.

Q 34. 2019, Percentage