Question

Solve the word problem.

If $1$ part of a red pigment requires $75\mathrm{ml}$ of base, how much of red pigment should we mix with $1800\mathrm{ml}$.

Answer 1

Unitary method:

$75\mathrm{ml}$ of the base is mixed with $1$ part of a red pigment.

$\Rightarrow$ For $1\mathrm{ml}$ base$=$$\frac{1}{75}$ part of red pigment.

$\Rightarrow$ For $1800\mathrm{ml}$ base$=\frac{1}{75}\times 1800$$=24$ part of red pigment.

Hence, $24$ part of the red pigment, we should mix with$1800\mathrm{ml}$.