Question

in a pen holder,the number of blue,black,and red pens are in the ratio1 : 2 : 3,respectively. if there are 6 black pens, find the number of red pens.
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Answer 1

$\huge\red{\bf{9 \:red\: pens}}$

$\pink{▬▬▬}$$\red{▬▬▬}$$\green{▬▬▬}$$\blue{▬▬▬}$$\orange{▬▬▬}$

$\blue{\bf{Blue}}$ $\pink{\bf{ : black}}$$\red{\bf{ : red}}$

$\green{\bf{1}}$ : $\pink{\bf{2}}$ : $\blue{\bf{3}}$

${\tt{black\: pen - 2x = 6}}$

${\tt{therefore\: x= 3}}$

${\tt{so\: number \:of \:red \:pens = 3×3=9}}$

Answer 2

9 red pens

Blue :black :red

3

black pen−2x=6

thereforex=3

=3×3=9