How many gallons of a 5% salt solution must be mixed with 50 gallons of a 9% solution to obtain a 7% solution?

I Think It Would Be 25%

Step-by-step explanation:

Because That's What I Think And I'm Sure Of.

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4

yes   because as the functions are graphed they eventually will intersect unless otherwise

step-by-step explanation: