Seen from the moon, the earth has 3.6 times the angular diameter of the Sun. What is the ratio of densities of the Sun and the Earth?
No extra information given apart from a list of constants, no info like radius of planets etc
Sam and I attempted this a few months back. This is on the trinity paper right? I think you just approximate them, i.e. 6000km for radius of Earth. Although you'd need to know earth-moon and sun-moon distances which I don't know exactly off the top of my head.