First you need to convert the fraction to a decimal which would be .7. then you divide 4.1 to .7 and you will get 5.86
2/3 as many tables as chairs means 3/2 as many chairs as tables. So you can make the equation 4t-95=(3/2)t. Solving for t, the amount of tables, gets you 38 and there were originally 4 times that amount of chairs in the hall so there must have been 152 chairs at first.
Maybe instead of posting this as a question you should have emailed it straight to Brainly