I need help with my math homework.

Question

amy invested ger saving in two investing funds. the amount she invested in fund A was twcie as luch as the amount she invested in fund b. fund a teturned a 4% profit and fund b returned a 8% profit. how much did she invest in fund b, if the total profit from the two funds together was $1600

Answer 1

.04(2x)+.08x = 1600

.16x =1600

x =$10,000 at 8%

2x =$20,000 at 4%

.04(2000)+.08(10000)=800+800=1600