Three pens and three notebooks cost $6.90. Two notebooks and one pen cost $4.10

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?

Two friends are reading books. jimmy reads a book with 21,356 words. his friend bob reads a book with one-and-a-half times as many words. which expression represents the number of words bob reads?

In the diagram below,abc is congruent to dec what is the value of x