How many ml of 20 percent acid should be added to pure acid to make 70 ml of 30 percent acid?

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .

The first digit is in the middle school 100s place