Question

I need help how to do this problem

Answer 1

This is a simple ratio question, but first you need to find the number of non red marbles uses... call it a
 
                         Jar                         Tank
                          54                            a
                         -----                          ----
                            1                           6750

so using your multiplication skills the number of non red marbles is 

Non red = 54 x 9750

thene the total number of marbles in the tank is Red + Non Red

hope it helps