Help pls will mark brainlist!!

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

Jude is making cement for a driveway. the instructions show the amount of each ingredient to make 1 batch of cement. complete each statement to adjust the ingredients for each new situation if jude uses these instructions.

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction