1.

A seller has some apples and oranges in the ratio of 7 ∶ 5. If 25 apples were rotten and he bought 25 new oranges, then the new ratio will be 1 ∶ 5. Find how many apples were left after rotten?1). 142). 83). 124). 10

Answer»

Initially number of apples = 7a and ORANGES = 5a

When 25 apples were rotten, NEW ratio becomes (7a – 25) / (5a + 25) = 1/5

⇒ 35a – 125 = 5a + 25

⇒ 30a – 125 = 25

⇒ a = 5

∴ Number of apples left after rotten = 7a – 25 = (7 × 5) – 25 = 10


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