Question

This is unitary method question: Cost of 12 pens=₹180 and you need to find cost of 1 pen and cost of 20 pen​

Answer 1

Answer:

Cost of 12 pen=₹180

Cost of 1 pen=180/12=₹15

Cost of 20 pens=₹15×20

=₹200

Answer 2

$\huge{\tt{\red{}\green{A}\purple{N}\pink{S}\blue{W}\orange{E}\red{R}}}☘$

Cost of 12 pens = 180/-

Cost of 1 pen = x

By cross multiplying we get,

$12x = \frac{180}{1} \\ x = \frac{180 }{12} = \frac{30}{2} = 15 \\ x = 15$

$\therefore$ Cost of 1 pen = 15/-

Cost of 20 pens is,

$15 \times 20 = 300$

$\therefore$ Cost of 20 pens = 300/-

$\large\tt\pink{@ItzUniqueGirl6}$