The oldest child in a family of four children is twice as old as the yougest. The two middle children are 13 and 15 years old. If the average age of the children is 13, how old is the youngest child?

A tank can be filled using pipes A, B or both. It takes pipe A, running alone 18 hours to feel the tank. It takes both pipes running together 9.9 hours to fill the tank. how long does it take pipe B, running alone, to fill the tank?

In gym class 8 students ran the 100m - the times recorded in seconds are shown below 15.61, 19.34, 16.1, 16.88, 17.13, 14.56, 26, 16.27 which would be the best to measure the average of the distances of the times from the mean time

Solve for q qq. 3 (q + 4 3) = 2 3 (q + 3 4 ) = 23, left parenthesis, q, plus, start fraction, 4, divided by, 3, end fraction, right parenthesis, equals, 2

Simplify: 6x (x-3) + x (2-5 x) + 3 x²

A travel agency charges $64 for each bus ticket and $82 for each train ticket. how much does it cost to buy 3 bus tickets and 4 train tickets

What is the standard deviation of the data set? 9 14 23 15 6 18 27 A. 2.6 B. 3.0 C. 6.8 D. 7.4

10 = s/2-7 to a whole number.

Simplify the expressions. 8v - 15v 7d+5 - 4d 12x + 9 - 3x - 4 3 (x - 4) + 5x

Determine whether or not the following question can be considered as a statistical question. Can Melissa's dog run faster than Emily's dog? Possible Answers: Yes No

What is 4/4 as a decimal