how many milliliters of a 15% saline and how many milliliters of a 40% saline solution must be mixed to produce 10 milliliters of a 30% saline solution?

Question

anonymous · Answer

x+y=10
15x+40y=10(30)

Solve the system.

anonymous · Answer

would i be using the elimination method to solve?

anonymous · Answer

Yes, or substitution.

anonymous · Answer

thnks i got it!

anonymous · Answer

Can you help me with this one too please? A total of $9,600 was invested in two separate accounts earning 5.5% and 3.75% annual interest. If the total simple interest earned for the year was $491.25, then how much was invested in each account?

anonymous · Answer

x+y=9600
.055x+.0375y=491.25

This one is a little messier, but you can solve it the same way you did the other.

anonymous · Answer

thanks again @AnimalAin

anonymous · Answer

@Luis_Rivera i got x=4 and y =6

anonymous · Answer

No sweat.  Do math every day.