Question

Your piggy bank has a total of 18 coins in it; some are dimes and some are nickels. If you have a total of $1.40, how many nickels do you have?

Answer 1

Let there be \(x\) nickels and \(y\) dimes. So we have 2 equations:
\[x+y=18\]\[5x+10y=140\]All you need is to solve this sytem.

Answer 2

Could you tell me what's the worth of nickels and dimes?

Answer 3

\[\huge \color{green}{\textbf{Welcome To Openstudy..}}\]

Answer 4

See, you are given with :

x + y = 18

Evaluate y from here by subtracting x from both the sides,

y = 18 - x

Now:

5x + 10 y = 140

5x + 10(18 - x) = 140

5x - 10x + 180 = 140

5x = 40

x = 8

So, he has 8 nickels..