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?
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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.
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 :)
