8.9.10. 8. If you buy 10 jin eggs at a time, 20% discount is 3 yuan less than 10% discount, then the original price of 10 jin eggs is -------- yuan 9. The ratio of the three integers is 1:2:4, and their sum is 84. Then the largest number among the three integers is () A 56 B 48 C 36 D 12 10. To make a 5-meter-long and 3-meter-wide refrigerator without cover, the cost of box bottom is 60 yuan per square meter, and the cost of box wall per square meter is 2 / 3 of the cost of box bottom per square meter. If the total cost of the whole water tank is 1860 yuan, calculate the height of the water tank

8.9.10. 8. If you buy 10 jin eggs at a time, 20% discount is 3 yuan less than 10% discount, then the original price of 10 jin eggs is -------- yuan 9. The ratio of the three integers is 1:2:4, and their sum is 84. Then the largest number among the three integers is () A 56 B 48 C 36 D 12 10. To make a 5-meter-long and 3-meter-wide refrigerator without cover, the cost of box bottom is 60 yuan per square meter, and the cost of box wall per square meter is 2 / 3 of the cost of box bottom per square meter. If the total cost of the whole water tank is 1860 yuan, calculate the height of the water tank

eight point three zero
9.B
10. Set height h M
5*3*60+2/3*60*(2*5*h+2*3*h)=1860
h=15