Question

need help asap !!

Answer 1

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?
i have to write the answer exactly as tehy put it into the computer or i get it wrong !

Answer 2

You need to make two equations.

Make d = dimes and n = nickels

d + n = 47

10d + 5n = 3.95

Answer 3

Lets use substitution. We want to solve for n.

d + n = 47
Subtract n from both sides.

d = 47 - n

Substitute that^ for the value of "d" the 2nd equation.

10d + 5n = 3.95

10(47 - n) + 5n = 3.95