Medal+Fanning~
Your piggy bank has a total of 47 coins in it; some are dimes and some are nickels. If you have a total of $3.95, how many nickels do you have?

Numerical Answers Expected!

Question

Medal+Fanning~
Your piggy bank has a total of 47 coins in it; some are dimes and some are nickels. If you have a total of $3.95, how many nickels do you have?

Numerical Answers Expected!

anonymous · Answer

@kelliegirl33

anonymous · Answer

I think this one is 15 nickels

anonymous · Answer

n + d = 47 --- > d = 47 - n
.05n + .10d = 3.95

sub 47 - n in for d in the 2nd equation
.05n + .10(47 - n) = 3.95
.05n + 4.70 - .10n = 3.95
-.05n = 3.95 - 4.70
-.05n = -.75
n = -.75/-.05
n = 15

you are correct...there are 15 nickels

anonymous · Answer

@kelliegirl33 for the numeric answer would it be written as n=15 or just 15?