Which sentences contain phrases that are hyphenated correctly? select 3 options?

Question: Which sentences contain phrases that are hyphenated correctly? select 3 options?

Of all the classes in our school, one-third of those classes walk to school and the rest ride the bus.

I will be 30 years old when my grandmother will be 90 years old.

We had to memorize about 25 verses of the poem which was about half of the poem.

Nishka Thirty-two cupcakes use one-seventh of a cup of sugar.