Question

Anu is four times as good as Binni in completing a task. Together they finish the same task in 7 hours. In how many hours will Anu alone complete the task?

A 22 Correct Answer Incorrect Answer
B 35/4 Correct Answer Incorrect Answer
C 31/4 Correct Answer Incorrect Answer
D 24 Correct Answer Incorrect Answer

Solution

Let the original salaries of Ravi and Sumit be Rs 4x and Rs 5x respectively. According to the question, (4x + 6000)/(5x + 6000) = 35/40  ⇒ 160x + 240000 = 175x + 210000  ⇒ 15x = 30000  ⇒ x = 30000/15 = 2000 Current salary of Ravi = 4 × 2000 = Rs. 8000 Current salary of Sumit = 5 × 2000 = Rs. 10000 So, increased salary of Sumit = 10000 + 6000 = Rs. 16000 ∴ Sumit's increased salary is Rs. 16000.

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