There is a batch of goods in the shopping mall. On the first day, 13% of the total goods were transported, and on the second day, 40% of the total goods were transported. At this time, there are still 20 tons left. How many tons are there in this batch of goods?

There is a batch of goods in the shopping mall. On the first day, 13% of the total goods were transported, and on the second day, 40% of the total goods were transported. At this time, there are still 20 tons left. How many tons are there in this batch of goods?

20 (1-13-40%) = 20 (415) = 75 (tons) a: a total of 75 tons

There is a batch of goods in the shop. On the first day, 25 tons of the total goods were transported. On the second day, 4 tons more than 14 tons were transported. At this time, 17 tons are left. How many tons are there in this batch of goods?

There are tons of this batch of goods: (17 + 4) △ 1-25-14, = 21 △ 720, = 21 × 207, = 60 (tons) a: there are 60 tons of this batch of goods

There is a batch of goods in the shopping mall. On the first day, 2 / 5 of the total goods are transported. On the second day, 4 tons more than 1 / 3 of the total goods are transported. At this time, 20 tons are left. How many tons are there in this batch of goods?
①1- 2/5- 1/3= 4/15
20 + 4 = 24 (ton)
24 △ 4 / 15 = 90 (ton)
② 20 + 4 = 24 (ton)
24 △ 1 - (1 / 3 + 2 / 5)] = 90 (ton) which of these two methods is right? Are they all the same? If they are put on the test paper, are they all correct?

You're great! You're all right

It takes 4 hours for car a to transport a pile of goods separately, and 5 hours for car B to transport a pile of goods separately. If car a transports 1 hour first, then car B transports with car a, how many hours does it take?
Use the unit to solve the problem. Thank you. It's urgent,

(1-1 / 4) / (1 / 4 + 1 / 5) = 5 / 3 (hours)