Quantitative Aptitude – Arithmetic – Mixtures – There are two drums, each containing a mixture

Quantitative Aptitude – Arithmetic - Mixtures – There are two drums, each containing a mixture

Slot -2 – Quantitative Aptitude – Arithmetic – Mixtures – There are two drums, each containing a mixture

There are two drums, each containing a mixture of paints A and B. In drum 1, A and B are in the ratio 18 : 7. The mixtures from drums 1 and 2 are mixed in the ratio 3 : 4 and in this final mixture, A and B are in the ratio 13 : 7. In drum 2, then A and B were in the ratio?

a) 251 : 163

b) 239 : 161

c) 229 : 141

d) 220 : 149

Answer: b) 239 : 161

Solution:
Let in drum 2, A and B are in the ratio m : n.

Given, In drum 1, A and B were in the ratio 18 : 7 = 18x : 7x .

Final mixtures ratio of contribution of drum 1 and drum 2 = 3: 4 = 75x : 100x

So A in final mixture = 18x × 3+100x × m/(m+n) = ( 154m+54n)/(m+n) x
B in final mixture = 7x × 3+100x × n/(m+n) = ( 21m+121n)/(m+n) x

Given A : B in final mixture = 13:7
Or (154m+54n )/(21m+121n )=13/7

1078m+378n=273m+1573n
805m=1195n

m:n=1195∶805=239∶161

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