In a 40 liters mixture of acetic acid and sodium acetate are in the ratio 3:1, find the amount of sodium acetate solution to be added to make the ratio 2:3.

1:

10 liters

2:

20 liters

3:

25 liters

4:

30 liters

5:

35 liters

Quantity of acid = $(40×43 )$litres = 30 litres, Sodium in it = 10 litres.

Let the required quantity of sodium to be added be x litres.

Then, $10+x30 $ = $32 $ ⇒ 20 + 2x = 90

⇒ 2x = 70

⇒ x = 35

$∴$ Sodium to be added = 35 litres.

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SBI PO Prelims 2017

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