Fifty pounds of a cement-and-sand mixture is 40% sand.

How many pounds of sand must be added for the resulting mixture to be 60% sand?

9 friend catches the bus into town. the total cost is 31.05. how much does it cpst for one person

The graph shows the relationship between the total cost and the number of erasers bought at the student store. Which statement is true?

If the original 24 m edge length x of a cube decreases at the rate 5m/min, when x=3 at what rate does the cube's surface area change

What is the third angle of a triangle if two of the angles measure 29 ° and 87 °.

A math conference has an attendance of 4950 people. Of these, 2110 are college professors and 2575 are female. Of the college professors, 960 are female. Find the probability that a randomly selected attendee is female or a college professor.

You flip a coin three times. a. what is the probability of getting heads on only one of your flips? b. what is the probability of getting heads on at least one flip?

woodland middle school $1,710 on calculators for the 180 students in the school. What is the rate spent per calculator?

Aliyah had some candy to give to her four children. She first took ten pieces for herself and then evenly divided the rest among her children. Each child received two pieces. How many pieces did she start with?

Park two has 12 more benches than Park one. If 2 benches were transferred from Park two to Park one, then Park two would have 2 times more benches than Park one. How many benches were originally there in Park two?

78362 divided by 509