I'll give you a question, please answer with step-by-step reasoning process.
The average number of fruits per basket in five baskets is 25. If basket A contains 15 apples, B has 30 mangoes, C has 20 peaches, D has 25 pears and E has some bananas, how many bananas are in basket E?

35
Each basket contains an average of 25 fruits so the 5 baskets in all contain 25 * 5 = 125 fruits.

The number of apples, mangoes, peaches and pears is 15 + 30 + 20 + 25 = 90.

The remaining fruits are bananas and they are 125 - 90 = 35 in number.

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The final answer: 35