Mathematics
charityskelling
18

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

+1
(2) Answers
rekeyia21

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.

Diener744

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 :)

Add answer