Question

cost of 12 pens is Rs.84, what is the
cost of 120 pens?​

Answer 1

Answer:

cost of 12 pens = 84

cost of 1 pen = 84/12

= 7

cost of 120 pens = 7 ×120

= 840

Step-by-step explanation:

at first finding out the price for 1 pen and then multiplying with required ones.

I hope this answer satisfies you. Thank You

Answer 2

Answer:

Cost of 12 pens is Rs 84

Let the cost of 120 pen will be x

$since \: here \: we \: get \: a \: directly \: proportional \\ \: relation \: between \: pens \: and \: their \: cost \\ \therefore \frac{12}{84} = \frac{120}{x} \\ \implies \frac{1}{x} = \frac{12}{84 \times 120} \\ \implies \: x = 84 \times 10 \\ \implies x = 840 \\ \follow \: me$