How much HCl (hydrochloric acid) is in a 90-milliliter bottle that is marked 60% HCl?

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

What is the difference between regular convex and concave polygons

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16