Question

This is a physics transformer lab
The number of loops in the primary coil divided by the number of loops in the secondary coil equals
the voltage in the primary coil divided by the voltage in the secondary coil. If the voltmeter attached
to the primary coil read 100 volts, what would the voltmeter attached to the secondary coil read?
I'm confused on what to do and also,
What part of the transformer does the straw represent, and how does this part transfer energy from
one coil to the other?