In 250 litres mixture of soda and water the ratio of amount of soda to that of water is 7 : 18. In order to make this ratio 2 : 3, how many more litres of soda should be added?
Amount of soda in 250 litres mixture = $$\frac{7}{(7+18)}\times250=70$$ litres
=> Amount of water = $$250-70=180$$ litres
Let $$x$$ litres of soda is added.
=> $$\frac{70+x}{180}=\frac{2}{3}$$
=> $$210+3x=360$$
=> $$3x=360-210=150$$
=> $$x=\frac{150}{3}=50$$
$$\therefore$$Â 50 litres of soda should be added.
=> Ans - (D)
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