Dan should buy 8 tomatoes because then he can make 32 slices which is more than enough to put on the sandwiches.
R-7=7 add the seven from both sides, leaving the r alone, because this is what you are trying to find. Thus the answer is r=14.
Divide 25 by 4 and you get 6 with a remainder of 1. That remainder of 1 can go over 4 to create the final answer of 6 and 1/4.
Use a calculator................
