What is 6 over 10 plus 13 over 100

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?