- Option : A
- Explanation : Average speed = Total distance covered / Total time taken. = (240 + 260) / (5+5) = 500/10 = 50 km/h

- Option : C
- Explanation : Here a= 25%. Required percentage = [a / (100+a)] x 100% . = (25/100) x 100 % = 20%

15. 8% of A is equal to 4% of B, then 20% of A is

- Option : A
- Explanation : (8/100) x A = (4/100) x B ⇒ (2/100)A = (1/100)B ⇒ (20/100)A = (10/100)B ⇒ 20% of A = 10% of B

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