Miss dean's laptop has 6 hours of battery life left, which is 75% of its maximum battery life. how many hours equal the laptops maximum battery life?

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.

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

You and a friend went to the movies.you spent half your money on tickets. then you spent 1/4 of the money on popcorn, $2 on candy, and $3 on a soda. if you have $1 left, hiw much money did u take to the movies?