The number of milliliters of isopropyl alcohol that are in a 400 ml bottle of this solution is 280 Ml
calculation
% V/V = volume of solute/ volume of solution x 100
Let the volume of solute be = y ml
the volume of solution = 400 ml
convert 70% to fraction = 70/100
by substituting the value in the equation
= y ml/ 400 ml = 70/100
by cross multiplication
100y =400 x70
100y= 28000
y= 280 ml