Question

if 24 ball pens costs 56rs., find the cost of 18 such pens by unitary method ​

Answer 1

Step-by-step explanation:

cost of 24 ball pens=Rs.56

cost of each pen=56/24

=2.33

cost of 18 pens=2.33×18

=Rs41.9

therefore,the cost of 18 pens will be Rs41.9 which can be rounded of to Rs.50

Answer 2

$\bf Cost \: of \: 24 \: pens= 56 \: rs \\\bf Cost \: of \: 1 \: pen =\frac{56}{24} \\\bf Cost \: of \: 18 \: pens=\frac{56}{24} \times18= 42 \: rs$