1.

1). 3 : 52). 1 : 33). 5 : 34). 4 : 3

Answer»

First of all, we use given QUANTITIES and place them in the FORMULA, to KNOW the required quantities.

Cost of 1 kg fruit of 1ST quality = Cost price of dearer = d = Rs. 90

Cost of 1 kg fruit of 2nd quality = Cost price of cheaper = c = Rs. 50

Desired cost of 1 kg of the mixture = Mean price = m = Rs. 65

$(\begin{array}{l} Required\;rate\; = \;\frac{{Quantity\;of\;Cheaper}}{{Quantity\;of\;Dearer}}\; = \;\frac{{d - m}}{{m - c}}\\ \Rightarrow \frac{{Quantity\;of\;Cheaper}}{{Quantity\;of\;Dearer}}\; = \;\frac{{65 - 50}}{{90 - 65}}\; = \;\frac{{15}}{{25}}\; = \;\frac{3}{5} \end{array})$

∴ The fruit seller should mix the mixture in the ratio 3 : 5



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