There are 20 questions and i got 65 percent how many did i get wrong

Asap 25 pts brainliest to right best/answer

In the pendulum formula t=2pi. read the problem on the picture ! ; $; $; ! ; ! ; ! ; )$; ! ; ! ; ! ; $; $; $! ; ! ; ); $; $$

Which fraction represents the ratio 35 : 42 in simplest form