Question

if 4 pens cost rupees 24 what do 15 pens cost?
NOTE: this is the question of ratio and proportion chapter and one thing i want step by step answer​

Answer 1

Step-by-step explanation:

4 pens:24 rupees

Here if the number of pens increases then it's cost also increases.

Therefore it is directly proportional.

Now 4/4 pen:24/4 rupees

1 pen:6 rupees

1×15 pens:6×15 rupees

15 pens:90 rupees

Hence the rate of 15 pens is 90 rupees