One eighth of tony's book are mystery book. he has 3 mystery books. how many books does tiny have in all?

X = total number of books
(1/8)x = 3
0.125 = 1/8
0.125x = 3
0.125x/0.125 = 3/0.125
x = 24
Tony has twenty four books in all

If 3 is 1/8 of Tony's books then he would have 24 books. To get this you have to divide 3 by 1/8.

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No he does not because he can only cover 12 square feet from 15 square feet which he will still need 3 more. this is because if 3×5=15 square feet and 15-12=3 which thats the answer