There is a pile of sand. The first time it carries away two fifths of it, and the second time it carries away the remaining two fifths?

There is a pile of sand. The first time it carries away two fifths of it, and the second time it carries away the remaining two fifths?

Hello, Yingying
The first 5 / 2 is a whole. Divide x into 5 parts and take 2 parts
In the second time, the overall score was less, so the score was the same, so it was larger in the first time
5/2＞5/2-5/2
I'm in grade five

A pile of sand was transported 40% in the first time and 112 tons in the second time, accounting for 75% of the total. How many tons of sand is there?

112 (75% - 40%) = 320 tons

A pile of sand was transported 40% for the first time and 112 tons for the second time, accounting for 75% of the total. How many tons are there in total?

Because two times accounted for 75% of the total, 40% of the first time
So 75% - 40% = 35% for the second time
The second transport of 112 tons
Therefore, there are 112 △ 35% = 320 tons
Hope to help you, I wish you a happy study!

There is a cone-shaped sand pile. The perimeter of the bottom is 25.12 meters, 5 meters, and the weight of each cubic meter of sand is 1.7 tons. How many times does it take to transport it by a 3-ton truck
(keep integers by rounding in)

The bottom radius is 25.12/3.14/2 = 4m
The volume is 4 * 4 * 3.14 * 1.5 * 1 / 3 = 25.12 cubic meters
Total weight 25.12 * 1.7 = 42.704 tons
42.704/3 about 15 times