You have $6000 to invest in stock funds. the first fund pays 5% annual interest and the second account pays 9% annual interest. if after a year you have made $380 in interest, how much money did you invest in each account?

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

9 x 8 divided by (5-3)=36