Question

Sang-Jin has only quarters and nickels in her piggy bank. She has 66 coins in the bank with a value of $11.50. How many quarters are in Sang-Jin’s piggy bank?

_________

Answer 1

@Loser66 @wio

Answer 2

Your system of equations should be

0.25x+0.05x=11.50
x+y=66

I'd multiply the first equation by 100 to get rid of the decimals.

Answer 3

Know how to solve from here?

Answer 4

no, sorry. you think you could explain a bit more? :) @dtan5457

Answer 5

(0.25x+0.05x=11.50)100?

Answer 6

x=3833.33333333? @dtan5457

Answer 7

You don't solve for x like that. Once you multiply by 100

25x+5y=1150

the 2nd one is still x+y=66 , which I would multiply by 25

25x+25y=1650
25x+5y=1150

subtract

20y=500

y=? (this is for nickels)

Answer 8

25?

Answer 9

Exactly. So there is 25 nickels, 66 coins in total, how many quarters?

Answer 10

40?

Answer 11

@dtan5457

Answer 12

66-25=?

Answer 13

41. Sorry, I typed the wrong number into my calculator. :)

Answer 14

Yeah.

So 25 nickels

41 quarters