Tropical fruit juice is mixed from mango, papaya and orange juice in the ratio 3 : 1 : 4. Aarushi has 400 ml of orange juice. If she uses it all:

(i) How many mango and papaya will he need?
(ii) How much tropical fruit juice will he make altogether?

Let the quantity of mango juice be 3x, the quantity of papaya juice be x and the quantity of orange juice be 4x.

According to the question,
$$\begin{gathered} 4x=400 \mathrm{m}l \\ \Rightarrow x=\frac{400}{4} \mathrm{m}l \\ \Rightarrow x=100 \mathrm{m}l \end{gathered}$$

(i) Quantity of mango juice = $3\times 100=300$ ml
and Quantity of papaya juice = 100 ml

(ii) Total quantity of tropical juice = 400 + 300 + 100 = 800 ml.