A kind of concrete is made of cement, sand and stone in addition to water. The ratio of cement, sand and stone is 2:3:5 Sand 1800kg, stones 3520kg, the construction director asked the workers on the basis of not adding these three materials, as much as possible to mix this kind of concrete, so how many kg of this kind of concrete can be mixed with these materials at most?

A kind of concrete is made of cement, sand and stone in addition to water. The ratio of cement, sand and stone is 2:3:5 Sand 1800kg, stones 3520kg, the construction director asked the workers on the basis of not adding these three materials, as much as possible to mix this kind of concrete, so how many kg of this kind of concrete can be mixed with these materials at most?

Because the ratio of cement, sand and stone is 2:3:5. That is to say, the same weight of 2 parts of cement needs 3 parts of sand and 5 parts of stone
If 1500 kg cement is used, sand (1500 / 2) x 3 = 2250 kg is needed, which is obviously not enough
If 1800kg sand is used, cement (1800 / 3) x2 = 1200kg and stone (1800 / 3) X5 = 3000kg are needed
1200Kg+1800Kg+3000Kg=6000Kg
A: up to 3000kg of this concrete can be mixed with these materials

A kind of concrete is made of cement, sand and stone in the ratio of 5:8:11. It is known that 1.6 tons of yellow sand is needed. How many tons of cement and stone are needed respectively?

1.0 tons of cement and 2.2 tons of stone

A kind of concrete is made up of cement, sand and stone in the ratio of 5:3:2. Now there are 30 tons of stone, yellow sand and cement respectively. When the yellow sand is used up
Are stones and cement surplus or not enough? How much is the surplus? How much should be added if not enough?

Cement, sand and stone are mixed with concrete according to the ratio of 5:3:2, which may be the weight ratio. If it is the weight ratio, then the cement with the largest amount should be used up first, and the rest should be sand and stone. If the sand is used up, which cement should be increased by 20 tons, but the stone need not be increased. After adding cement, when the cement and sand are used up, there are still 10 tons of stones left

Each 9t of cement stone and yellow sand is mixed into concrete with sand stone and yellow sand in the ratio of 5:3:2. If the stone cement is used up, how many tons of yellow sand are needed

Think like this:
(1) When the stones are used up, they should be mixed into concrete according to the ratio of 5:3:2,
(2) Then, cement: Stone: sand = 15:9:6 ratio is OK
The formula is:
(3) Tonnage of cement shortage: 9 △ 3 × 5-9 = 6 (T)
(3) Tonnage of huangshaduo: 9-9 △ 3 × 2 = 3 (T)