Question

A transformer has a primary voltage of 115 V and a secondary voltage of 24 V. If the number of turns in the primary is 345, how many turns are in the secondary?

Answer 1

72

Step-by-step explanation:

345/115=3 3*24=72

Answer 2

Here's a fun and useful factoid:

The ratio of the voltages on a transformer is the same
as the ratio of the number of turns in each winding.

So the ratio of (345 to the secondary turns) is (115V to 24V).

That's a proportion.

(115/24) = (345/x)

I'll bet you can take it and solve it from here.
Just cross-multiply in the proportion and etc. etc.