a chemist has 100ml of 25% acid solution. how much of the solution should he drain and replace with 70% acid solution to get a 100mg of 60% acid solution

Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. release your mouse button when the item is place. if you change your mind, drag the item to the trashcan. click the trashcan to clear all your answers. solve this quadratic equation using the quadratic formula. 2x2 - 2x=1 need asap