There are 40 tons of cement on the construction site, two fifths of which are used in the first day, and six fifths of which are used in the second day. How many tons of cement are used in each of the two days
1. 40 * 2 / 5 = 16 tons
2. 16 * 6 / 5 = 3.2 * 6 = 19.2 tons
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