Disha wants to paint her room brown. For that she uses a certain violet paint which contains $30 %$ blue pigment and $70 %$ red pigment by weight. She mixes that violet paint with a certain green paint which contains $50 %$ blue pigment and $50 %$ yellow pigment. When these paints are mixed to produce the brown paint which she uses, it contains $40 %$ blue pigment. If the brown paint weighs 10 grams, then the red pigment contributes how many grams of that weight?

2.8 gms

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3.5 gms

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4gms

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5.3 gms

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Solution

The correct option is B
3.5 gms

Use alligation,

Considering only the blue pigment in all the paints

Thus, 5 gms of each paint is used. Weight of red paint = $\frac{7}{10} \times 5$ =3.5 gms. Option (b)

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The correct option is B 3.5 gms Use alligation, Considering only the blue pigment in all the paints Thus, 5 gms of each paint is used. Weight of red paint = 710×5 =3.5 gms. Option (b)

The correct option is B
3.5 gms

Use alligation,

Considering only the blue pigment in all the paints

Thus, 5 gms of each paint is used. Weight of red paint = $\frac{7}{10} \times 5$ =3.5 gms. Option (b)