A shopkeeper offers $1$ black pen on buying $4$ blue pens. If he gave $5$ black pens in total, calculate the number of blue pens sold.

20

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16

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24

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Solution

The correct option is A $20$
For every $4$ blue pens, the shopkeeper sold $1$ black pen for free.

The ratio of blue pens to black pens is $4 : 1$ .

The double number line is

Add $1$ to the bottom line and $4$ to the top line.

From the double number line, for $5$ black pens, he sold $20$ blue pens.

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A shopkeeper offers 1 black pen on buying 4 blue pens. If he gave 5 black pens in total, calculate the number of blue pens sold.

The correct option is A 20For every 4 blue pens, the shopkeeper sold 1 black pen for free. The ratio of blue pens to black pens is 4:1. The double number line is Add 1 to the bottom line and 4 to the top line. From the double number line, for 5 black pens, he sold 20 blue pens.

A shopkeeper offers $1$ black pen on buying $4$ blue pens. If he gave $5$ black pens in total, calculate the number of blue pens sold.