题目

Over the last 70 years, researchers have been studying happy and unhappy people and finally found out ten factors that make a difference. Our feelings of well-being at any moment are determined to a certain degree by genes. However, of all the factors, wealth and age are the top two. Money can buy a degree of happiness. But once you can afford to feed, clothe and house yourself, each extra dollar makes less and less difference. Researchers find that, on average, wealthier people are happier. But the link between money and happiness is complex. In the past half-century, average income h小明同学在配置盐水时，称得的盐水的质量如图1所示，用量筒测量水的体积如图2所示，然后将盐倒入量筒中待盐完全溶化后，量筒中的液面如图3所示，则盐的质量是______g，盐水的体积是______cm3，该盐水的密度是______kg/m3