A tank can filled in 5 hours by two pipes when both are used. How may hours are required for each pipe to fill the[..]

How much water must be evaporated from 60 kilograms of a 15% salt solution in order to obtain a 40% solution?

Robert has a jet ski that will travel at the rate of 35mph in still water. he can go 50miles up a river in the same[..]

If Ronnie is 5 years younger, he will be 1/2 as old as his brother. But now Ronnie is 3/4 as old as he is. How old[..]

at sea, the distance to the horizon is directly proportional to the square root of the evevation of the observer. if[..]

There are two coin purses.The first coin purse contains a Nickel and a Dime.The second coin purse contains a Penny[..]

Maria has 12 coins that total 28 cents. What coins does she have.

Is the range for a set of measurements greater than or equal to 0? Explain Is the sample standard deviation a[..]

A set has 63 subsets, how many elements are there in a set?

You are attending a very loud concert. To avoid ear damage, you decide to move farther from the stage. Sound[..]