Three parts of concrete, sand, two parts of stone, cement together, how much sand accounts for concrete, how much less stone than sand? If 2 tons of cement is needed, how many tons of concrete

Three parts of concrete, sand, two parts of stone, cement together, how much sand accounts for concrete, how much less stone than sand? If 2 tons of cement is needed, how many tons of concrete

The size of the stone determines the amount of sand, generally 2 tons of cement with 14.5 tons of stone, 8.3 tons of sand

Cement stone sand each 60 tons, according to 5:3:2 mixing concrete, cement just used up, stone and sand each remaining how many tons?
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60 △ 5 = 12 (ton)
5-3=2
2 × 12 = 24 (tons)
5-2=3
3 × 12 = 36 (tons)
A: there are 24 tons of stones and 36 tons of sand left