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Sandy + Tina : Vivian : total

3 : 1 : 4

15u : 5u : 20u

Tina + Vivian : Sandy : total

3 : 2 : 5

12u : 8u : 20u

8u + 5u = 13u 

13u/20u = 13/20

(b)

13u——- 520

1u ——- 520/13 = 40

20u ——- 20 x 40 = 800

Ans : (a) 13/20; (b) 800 tarts.

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