How many hydrogen bonds exist between this dna strand and its complementary strand? 5\'–acagtat–3\'?

Complementary strand for 5'–ACAGTAT–3' is 3'–TGTCATA–5'.
Nucleobase (guanine, cytosine, adeninem, thymine) on one strand bonds with just one type of nucleobase on the other strand (guanine-cytosine and adenine-thymine). Between adenine and thymine are two and between guanine and cytosine are three hydrogen bonds.
Hydrogen bonds: 5 × (adenine-thymine pair) + 2 × (guanine-cytosine pair) =
= 5 × 2 + 2 × 3 = 16.

You use the atomic number to find out how many protons and neutrons there are in the atom. you use the atomic mass to find out how many protons and electrons there are in the atom. 

Is there a picture or answer choices?