A bag contains 90 marbles, some red and some blue. If there are 60 blue marbles, what is the ratio of blue to red marbles?

Coach minter wants each of his students to run 20 laps around the track he is keeping track of how many laps each student has completed Edgar finished 25% of the 20 laps Noel ran 2/10 of the laps Emily completed 15% of the laps Wyatt finished sixth

How many 3/5s are in 1

Suppose that a child desires 10 different toys for her birthday. Twenty people will come to her birthday party, each of them equally likely to bring any one of the 10 toys. Let X be the number of different types of toys brought to the party.

An alloy of tin is 15% tin and weighs 20 pounds. A second alloy is 10% tin. How many pounds of the second alloy must be added to the first to get a 12% mixture?

The infinite sequence - 1, - 2, - 3, - 4, - 5, ... can be generated with which explicit formula?

In a brown bag that contains 120 m&m's, there is exactly 1 green m&m. you have one chance to reach into the bag and pull out one m&m. what is the probability of reaching in and pulling out the green m&m on the first try?

What is 348 rounded to the nearest ten

Solve this answer 5/3 + 2/5

The algebraic expression 1.5x gives the total length of shelf space needed in inches for x encyclopedias. Find the length of shelf space needed for a set of 30 encyclopedias.

What is the fraction and decimal for 71%