Amy, Siti and Tina have a total of 730 story books. Tina has 50 more books than Amy. Amy has 70 books more than Siti. How many story books does Tina have?

Answer 1

S + (70+S) + (70 + S + 50) = 730

3 S + 190 = 730

3 S = 540

S = 180

(70 + S + 50) = 120+180 = 300