There are 10 books on the table. Two-fifths of them are reading books and three-tenths of them are math books. There is one fewer science book than math books and the rest are history books. How many history books are there?
How many reading books are there? ** Out of the 10 books, 10 x 2/5 = <<10*2/5=4>>4 are reading books.
How many math books are there? ** While 10 x 3/10 = <<10*3/10=3>>3 are math books.
How many science books are there? ** There are 3 - 1 = <<3-1=2>>2 science books.
How many books are there? ** So, the total number of reading, math, and science books is 4 + 3 + 2 = <<4+3+2=9>>9.
How many history books are there? ** Thus, there is only 10 - 9 = <<10-9=1>>1 history book.
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