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Secondary data refers to data that is collected by someone other than the user. Common sources of secondary data for social science include censuses, information collected by government departments, organizational records and data that was originally collected for other research purposes.so say it in and do in 3rd person

Primary data is data that is collected by a researcher from first-hand sources, using methods like surveys, interviews, or experiments. It is collected with the research project in mind, directly from primary sources. The term is used in contrast with the term secondary data.so say it in first person

So,

Let l represent the length and w represent the width.

The first statement translates to:
2l + 2w = 72

The second statement translates to:
l = 2w

We will use substitution, as this is the easiest method.
2(2w) + 2w = 72

Distribute.
4w + 2w = 72

Collect Like Terms.
6w = 72

Divide both sides by 6.
w = 12

l = 2w
l = 2(12)
l = 24

Check.
2(24) + 2(12) = 72
48 + 24 = 72
72 = 72 This checks.

Length = 24 cm
Width = 12 cm