Question

Activity No 4
) The cost of 20 dists of paper is Rs 400. What is the cost or dista of paper
b) The cost of I dozen of pencil is Rs.60. What is the cost of 1 pen
) If the cost of one pe, is Rs. 12 then what will cost of 15 such pen​

Answer 1

Step-by-step explanation:

So Im gonna be using Direct variation and Inverse variation method

Let x = Cost of one paper

a] No of papers = 20

Cost of 20 papers = Rs 400

  20    400

    1        x

x = 400/20

x = Rs 20

b] Let x = Cost of 1 pen

   1 dozen = 12 pen

   Cost of 12 pen = Rs 60

  12    60

    1      x

x = 60/12

x = Rs 5

c] Let cost of 15 pen = x

    1   12

    15   x

x = 15 *12

  = Rs 180

I hope its helpful.

Answer 2

Answer:

Step-by-step explanation:

Let x = Cost of one paper

a] No of papers = 20

Cost of 20 papers = Rs 400

 x = 400/20

x = Rs 20

b] Let x = Cost of 1 pen

1 dozen = 12 pen

   Cost of 12 pen = Rs 60

 x = 60/12

x = Rs 5

c] Let cost of 15 pen = x

x = 15 x12

= Rs 180