A chemist needs 9 liters of a 50% solution all she has is a 20% and 50% solution. How much of each does she need?

What two numbers multiply to get 45 but add to get - 12

What is the maximum r-value for the polar equation r = - 3 + 5 sin theta a. 8 b. 5 c. 2 d. 3

An amusement park changes admission plus a fee for each ride. Admission plus two rides cost $10. Admission plus five rides cost $16. What is the charge for admission and the cost of a ride?

Andrea uses 9.8 pints of blue paint to paint her bedroom walls. 2/5 of this amount is blue paint, and the rest is white paint. How many pints of white paint did she use to paint her bedroom walls?

Twice the difference of a number and 3 is the same as 1 added to three times the number. Find the number.

Which type of statement has the form " if A, then B"?

Fine two consecutive even integers such that twice the smaller is 26 more than the larger.

The ratio of zebras to elephants at the zoo is 6:5. The ratio of Gorillaz two zeros is 7:2. There are 30 zebras at the zoo. How many elephants are there? How many gorillas are there

A telephone number consists of seven digits, the first three representing the exchange. how many different telephone numbers are possible within the 537 exchange? the answer is.

Kenny's weight is 6/7 times Melvin's weight. How many times the total weight of the two boys in Kenny's weight?