Xia is in the process of making ice cream. She has heated all the ingredients to 60 °C and put them in refrigerator to freeze. If the cooling rate is 9 °C per hour, what will be the temperature in freezer after 9 hours ?
While doing the science experiment in the physics lab, Xiu Juan had to take 7 measurements of the temperature and write the average of those as an answer. If the measurements of the temperature is -1, 1, 2, 1, -1, 2, -1, what is the final answer of her experiment ?
Li's income is 50% less than Ling's income, Yue Ying's income is 20% less than Li's income, and Cong's income is 30% less than Li's income. If Ling gave 30% of his income to Yue Ying and 70% of his income to Cong, Yue Ying's new income would be what fraction of Cong's new income?