The food for students' nutritious lunch should include three types of food: fruits and vegetables, soy products, fish, meat, poultry and eggs. It is known that the mass ratio of fruits, vegetables and fish is 13:5. If you use 50 grams of meat and 25 grams of eggs for lunch, how many grams of melons, fruits and vegetables are reasonable?
学生营养午餐的食物应包括瓜果蔬菜类、豆制品类、鱼肉禽蛋类这三类食物．已知瓜果蔬菜类和鱼肉类的质量比是13：5．如果午餐用50克肉、25克蛋，应用多少克瓜果蔬菜比较合理？
<gadget id="calculator">13 / 5</gadget>
<output>13/5 = around 2.6</output>

<gadget id="calculator">(13/5) * 50</gadget>
<output>130</output>

<gadget id="calculator">(13/5) * 25</gadget>
<output>65</output>

<gadget id="calculator">130 + 65</gadget>
<output>195</output>

<result>195</result>