100 students were surveyed. Of those surveyed, 60% said they had a sister. Of that group, 30% also had a brother. Of the students who did not have a sister, 50% had a brother.

If i i clock in at 2:30 and i have 30 minutes break what time do i i clock in

Requirements for proofs in a logical system

Mark gave 21 tadpoles to his 3 friends. Mark gave twice as many tadpoles to David as he did Chris. George received twice as many tadpoles as David. How many tadpoles did each friend receive?

Find the sum of - 3n - 4 and 8n - 2

Simplify 2 (4x-3) - 3 (5-x)

Micah is buying items for a birthday party. If he wants to have the same amount of each item, what is the least number of packages of cups he needs to buy?

Identify the like terms and terms 1.4c + 11.4 - 2c - 7.3c =

Factor the following quadratics 1) w^2 + 18w + 77 2) x^2 - x - 42

How do you write 1:3 as a fraction

A cylinder has an 18-inch diameter and is 15 inches tall. It is filled to the top with water. A 6-inch-diameter ball is placed within the cylinder, and then the cylinder is filled with water.