Question

4.) A coin bank has 15 coins, pennies and quarters, worth $1,35. How many of each type of coin are
there?

Answer 1

Answer:

Step-by-step explanation:

Let p = the pennies

Let q = the quarters.

       p + q =       15                  

.01* p + .25q = 1.35                multiply the top equation by 0.01

.01  p  + .01q =  .15                 Subtract

              .24q = 1.20              Divide by 0.24

q = 1.20 / 0.24

q = 5

So there are 5 quarters.

p + q = 15

p + 5 = 15                                Subtract 5 from both sides

p = 15 - 5                                 Combine

p = 10

the top equation p + q = 15 is the number of coins

The second equation is the value they have.    

                       

Answer 2

There are ten pennies and 5 quarters. 5x.25= 1.25. 10 pennies= .10. 1.25+.10= 1.35