# Amy, Siti and Tina have a total of 630 story books. Tina has 50 books more than Amy, Amy has 70 books more than Siti. How many story books does Tina have? plzzzz show working out

Let us assume the number of story books that Siti has = x Then The number of story books that Amy has = x + 70 The number of story books that Tina has = (x + 70) + 50 = x + 120 Then x + x + 120 + x + 70 = 630 3x + 190 = 630 3x = 630 - 190 3x = 440 x = 440/3 Then The number of books that Tina has = (440/3) + 120 = (440 + 360)/3 = 800/3 = 266.66 So Tina has 267 books as the number of books cannot be represented by a fraction.

Siti's books = x Amy's books = x+70 Tina's books = (x+70)+50=x+120 All books = x + (x+70) + (x+120) And all books = 630 It means equation: x + x + 70 + x + 120 = 630 3x + 190 = 630 subtract 190 from both sides: -190 -190 3x = 440 divide both sides by 3: :3 :3 x = 146 2/3 Tina's books: x+120 = 146 2/3 +120=266 2/3 It means Tina has 266 or 267 story books (because book in fractions doesn't count for a book) Or you wrote wrong numbers :)