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

d + n = 20 --> d = 20 - n
.10d + .05n = 1.25
Now just sub 20 - n in for d in the 2nd equation :)

Answer 2

still dont get it

Answer 3

d stands for dimes
n stands for nickels
your question says d + n = 20 (there are 20 coins consisting of dimes and nickels)
.10d + .05n = 1.25 (dimes are worth .10 and nickels are worth .05 and there is a total of 1.25)
do you understand this so far ?

Answer 4

yesss

Answer 5

now we have 2 equations
d + n = 20
.10d + .05n = 1.25
change the first equation to d = 20 - n because you are looking for n.
now sub 20 - n in for d in the other equation.
.10(20 - n) + .05n = 1.25
now distribute the .10 through the parenthesis.
Can you do that ?

Answer 6

yes

Answer 7

show me :)

Answer 8

thats what she said lol okay hold on

Answer 9

lol....get your mind out of the gutter