A DNA fragment contains 10 adenyl nucleotides and 5 guanyl nucleotides

A DNA fragment contains 10 adenyl nucleotides and 5 guanyl nucleotides. What will be the number of hydrogen bonds of a given DNA fragment?

Hydrogen bonds are established between adenic (A) and thymine (T) nucleotides, as well as between guanine (G) and cytosine (C). The number of hydrogen bonds in these pairs is different. There are two hydrogen bonds between A and T, and three between G and C.

There are 10 adenine nucleotides, therefore thymine nucleotides are also 10. Therefore, there will be 10 such pairs, and in these pairs there are only 20 hydrogen bonds. 5 guanine nucleotides, which means 5 pairs of G with C. There are 15 hydrogen bonds in these pairs. In total, there are only 35 hydrogen bonds in the DNA fragment.