I have tried to use other sites to help me and i cant figure this one out, its not a mutiple choice and if you don't know how to solve is please don't answer.

What is the first quartile of the data set? 10, 11, 12, 15, 17, 19, 22, 24, 29, 33, 38 a. 12 b. 19 c. 29 d. 10

Acoin bank containing only dimes and quarters has 12 more dimes than quarters. the total value of the coins is $11. how many quarters and dimes are in the coin bank?

X+ y = 5 ; x - y =3 solve using linear combination