Question

A coin bank contains $17.00 in pennies and nickels. If there are 1140 coins in the bank, how many coins are nickels?
a. 134
b. 137
c. 140
d. 143

Answer 1

We can write a system of equations.

x + y = 1140
0.01x + 0.05y = 17

Answer 2

okay, what you can do is set up a system of equations... \[0.01p+0.05n=17\]\[p+n=1140\] p=pennies, n=nickels

Answer 3

gah, iGreen, stop stealing my thunder XD lol jk

Answer 4

We can solve using substitution.

x + y = 1140

Subtract 'y' to both sides:

x = -y + 1140

Plug in '-y + 1140' for 'x' in the 2nd equation:

0.01(-y + 1140) + 0.05y = 17

Distribute 0.01 into the parenthesis:

-0.01y + 11.4 + 0.05y = 17

Combine like terms:

0.04y + 11.4 = 17

Subtract 11.4 to both sides, what's 17 - 11.4?

Answer 5

5.6

Answer 6

then divide by 0.04

Answer 7

so its c right

Answer 8

do you still need help @~cuddle_monster~

Answer 9

i dont think so they help alot but thanks for the offer

Answer 10

Yeah, 5.6 / 0.04 = ?

Answer 11

Yep, C is correct..

5.6 / 0.04 = 140

Answer 12

thanks you guys

Answer 13

np