There is a reaction a + 2B → 3C + 4D as follows. It is known that the sum of mass of a and B is 18G and the mass ratio of C to D is 4:5 How much is C

There is a reaction a + 2B → 3C + 4D as follows. It is known that the sum of mass of a and B is 18G and the mass ratio of C to D is 4:5 How much is C

According to the law of conservation of mass, the total mass of C and D is 18G, so the mass of C is 8g,