The dna of a cell is analyzed and found to contain 28 percent thymine. what percent of the dna would by cytosine?

22% Cytosine
If Thymine is at 28% and Thymine always pairs with Adenine (another compound that is one of four constituents of nucleic acids, often paired with Thymine in double-stranded DNA), then Adenine is also 28%. The remaining 44% will then be divided between Cytosine and Guanine (another compound) since they also form pairs.

Aneutral atom must have the same number of neutrons and protons? no, they must have the same number of protons and electrons

Then it is june the conclusion to the second sentence is just restating "if it is june then it is summer"