let

p = the number of atoms of Pt in the Universe

s = the number of atoms of Si in the Universe

a = the number of atoms of Ag in the Universe

the number of atoms of platinum (Pt) in the universe is estimated to be 1.4 times the number of atoms of silicon (Si) in the universe

p = 1.4s

the number of atoms of silver (Ag)in the universe is estimated to be 0.33 times the number of silicon in the universe

a = 0.33s divide both sides by 0.33

s = a/0.33

plug s = a/0.33 into p = 1.4s

p = 1.4(a/0.33)

p = (1.4/0.33)a

p = 4.24a

the number of atoms of platinum in the Universe is approximately 4.2 times the number of atoms of silver in the Universe.