a chemist has a 30% and a 45% acid solution. what amount of each solution should be used to make 500ml of solution with 35% acidity?

a)133 1/3 ml of 30% solution and 366 2/3 ml of 45% solutionb)250 ml of each solutionc)333 1/3 ml 30% solution and 166 2/3 ml of 45% solutiond)400 ml of 30% solution and 100 ml of 45% solution