If you transport a batch of goods, 9 / 20 of the total quantity has been transported, which is 7.8T less than the rest. How much T is the ton of goods

If you ship a batch of goods, 9 / 20 of the total number has been shipped, which is 7.8T less than the rest. How much T is the ton
7.8 ÷（1 -9/20 -9/20）
=7.8 ÷1/10
=78 T

For a project, team a will complete it in 12 hours and team B will complete it in 15 hours. If the two teams work together for two hours and team B will complete it alone, how many hours will it take?

[1 - (112 + 115) × 2] / 115 = [1-320 × 2] / 115 = [1-310] / 115 = 710 / 115 = 10.5 (hours) a: it will take another 10.5 hours to complete

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