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NCERT Solutions Class 8 Mathematics Solutions for Exercise 13.1 in Chapter 13 - Direct and Inverse Proportions
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Q3) In question 2 above if 1 part of a red pigment requires 75 ml. of the base, how much red pigment should we mix with 1800 ml. of base.
Answer:
Solution:
Let the parts of red pigments mix with 1800 ml. base be x.
Since it is in direct proportion.
Therefore, we obtain
\frac{1}{75}=\frac{x}{1800}\Rightarrow75\times x\ =\ 1\times1800
\Rightarrow\ x\ =\ \frac{1\times1800}{75}=\ 24\ parts.
Thus, 24 parts of the red pigment should be mixed with 1800 ml. base.
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