an empty relative density bottle weights 20g. the bottle weights 40g when filled with petrol and 60g when filled with water. determine the density of the petrol.( density of water=1000kg/m³)​

Answer is in the photo. I can only upload it to a file hosting service. link below!

https://cutt.ly/Kzv78uJ

did anyone actually do this? like if anyone has submitted this i rly need .

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.