Question 125288
(x)(0.80)+(30)(0.22)=(30+x)(0.70)

0.8x+6.6=21+0.7x

0.1x=14.4

x=144 gallons (Answer)


Alternatively, we may use the method of alligation.

0.70-0.22=0.48

0.80-0.70=0.10

Then T1/T2=0.10/0.48=0.2083333

Since T1=30, we have 30/T2=0.2083333

T2=144 gallons (Answer)