pears have the same mass as 4 peaches, 3 apples have the same mass as 5 peaches, and 1 apple and 1 pear have the same mass as how many peaches?
3个梨和4个桃子的质量相等，3个苹果和5个桃子的质量相等，一个苹果、一个梨的质量和几个桃子的质量相等？
<result>3</result>