A pile of sand weighs 700 tons. A truck transports 5 tons each time. How many times do seven vehicles need to transport?

A pile of sand weighs 700 tons. A truck transports 5 tons each time. How many times do seven vehicles need to transport?

700 ÷ (5 × 7) = 700 △ 35, = 20 (Times), a: 7 vehicles need to transport 20 times

A car transports 5 tons of sand each time. According to this calculation, how many tons of sand are transported by 15 cars four times?

15x5x4 = 300 tons

There is a pile of sand that has carried away three fifths of the total amount for the first time and 45 tons for the second time. At this time, the ratio of the tons carried away to the remaining tons is 3:1
How many tons of sand was there?

Now we've taken away 3 (3 + 1) = 3 / 4 of the total
So a total of 45 (3 / 4-3 / 5) = 300 tons

A pile of 20 tons of sand was transported for the first time, one fourth of the total, and the next day, one fifth of the total. How many tons of sand are left?

20x (1-1 / 4-1 / 5) = 11 (tons)
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