00:01
Let's let x equal the number of 500 peso bills, and let's let y equal the number of 1 ,000 pesos bills.
00:23
We know that there are 4 ,000 pesos in total, and that's going to be the sum of 500 times the number of 500 peso bills, plus 1 ,000 times the number of 1 ,000 peso bills.
00:36
And we also know that a total number of bills is equal to 20.
00:39
So x plus y is equal to 20, which means that x is equal to 20 minus y, just to solve for one of them.
00:51
And then we can plug in, so we have an equation in one variable like so.
01:07
And then we'll simplify 500 times 20 is 10 ,000 minus 500 y plus 1 ,000 plus 100 y, so that's plus 500 y.
01:26
That doesn't.
01:33
That does not make sense.
01:36
Negative 6 ,000 equals 500 y...