Question

Your piggy bank has a total of 20 coins in it; some are dimes and some are nickels. If you have a total of $1.25, how many nickels do you have? 15 10 5 20

Answer 1

Okay, let's start with ten nickels.

Answer 2

That would be a total of 50 cents.

Answer 3

You still have ten coins left, and they have to be dimes.

Answer 4

how did you do that

Answer 5

i meant 15 coins not 20

Answer 6

And ten times ten is 100 cents, so a dollar. And a dollar plus 50 cents is 1.50, which is too much.

Answer 7

???

Answer 8

my problem on my homeowrk says this a cash register contains 15 coins in dime and nickels. the total value is 1.25. how many coins of each typer are there

Answer 9

Oh, okay.

Answer 10

Then I'll start over.

Answer 11

Just pick a random number of nickels to start with...let's say 7.

Answer 12

If you have 7 nickels, how much money is that?

Answer 13

35 cents

Answer 14

Good, and how many coins do we have left that have to be dimes?

Answer 15

8 coins left...

Answer 16

Good, and since they have to be dimes, how much money is that?

Answer 17

80 cents?

Answer 18

Sorry, my cat just walked on the keyboard and deleted a bunch of stuff. And yes, your answer is right.

Answer 19

And 80 + 35 is?

Answer 20

45

Answer 21

Uh, no. It's 1.15

Answer 22

So, not enough.

Answer 23

Let's try again with 8 nickels.

Answer 24

8 times 5 is 40.
7 times 10 is 70.
40+70 is 1.30

Answer 25

still too much

Answer 26

Yeah, what I don't understand, is with 7 nickels it's too little, and with 8 it's not enough...

Answer 27

ya. thanks anyway. i get it somehow. it suppose be into a equation

Answer 28

Oh, sorry, should I help you with an equation?

Answer 29

d + n = 20 -->d = 20 - n
.10d + .05n = 1.25

now sub 20 - n in for d in the second equation and solve for n

Answer 30

Like that made sense to her.

Answer 31

d is dimes
n is nickels

Answer 32

a dime is a tenth of a dollar so therefore .10

Answer 33

a nickel is a twentieth so therefore .05

Answer 34

d and n are variables, so they can be any number. if you multiply d with .10 it means for example 5 dimes times 0.10, which is .50, or 50 cents.

Answer 35

Do you get it @bs?

Answer 36

ugh, she's offline

Answer 37

don't you hate that....do all that explaining and she is gone

Answer 38

Yeah, ikr

Answer 39

lol, but now we both got medals! :)

Answer 40

yes we do :)

Answer 41

@texaschic101 's way is MUCH easier. A system of equations.

\(\Large{d+n=20\\
.10d + .05n = 1.25}\)

This is how I would set up the problem, and I am fairly confident that this is how the problem was intended to be solved.

Answer 42

that is how I would set it up also :)