Cement, stone and sand are 80 tons each. Concrete is mixed with cement and stone according to the mass ratio of 8:5:3. The cement is just used up. How many tons of stone and sand are left?

Cement, stone and sand are 80 tons each. Concrete is mixed with cement and stone according to the mass ratio of 8:5:3. The cement is just used up. How many tons of stone and sand are left?

Shiziyu 80-80 × 5 / 8 = 30
Sand remaining 80-80 × 3 / 8 = 50