D.LET X= THE NUMBER OF LITERS OF THE 40% SOLUTION. USE THE EQUATIO...

11. d.Let x= the number of liters of the 40% solution. Use the equation 0.40x+ 0.20(35) = 0.35 (x+ 35)to show the two amounts mixed equal the 35% solution.Solve the equation: 0.40x + 0.20(35) = 0.35(x+ 35)Multiply both sides by 100 in order to work with more compatible numbers:40x+ 20(35) = 35(x+ 35)40x+ 700 = 35x+ 1,225Subtract 700 on both sides: 40x+ 700 – 700 = 35x+ 1,225 – 700Subtract 35xfrom both sides 40x– 35x= 35x– 35x+ 525

5x

Divide both sides by 5:

5

⁵²⁵

5

x= 105 liters of 35% iodine solution