A total of 148 tons of materials were transported into a construction site. The weight of yellow sand is 2 / 3 of that of cement, and the weight of stone is 4 / 5 of that of cement. How many are yellow sand, stone and cement

A total of 148 tons of materials were transported into a construction site. The weight of yellow sand is 2 / 3 of that of cement, and the weight of stone is 4 / 5 of that of cement. How many are yellow sand, stone and cement


Cement = 148 ÷ (2 / 3 + 1 + 4 / 5) = 60 tons
Huangsha = 60 × 2 / 3 = 40 tons
Stone = 60 × 4 / 5 = 48 tons
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A construction site uses 80.4 tons of cement in the morning, and the weight of cement transported in the afternoon is equal to the weight of cement left in the morning. At this time, there are 181.2 tons of cement on the site
What percentage of the weight of cement transported in this afternoon is that of the original cement on the construction site?


181.2 △ 2 = 90.6 tons
90.6 + 80.4 = 171 tons
90.6 △ 171 = 53% (approximately equal to)