The cost of 6 balls is Rs 42. What would be the cost of 10 balls, 15 balls and 20 balls? Write them in the form of a table.

Asked by Topperlearning User | 2nd Sep, 2015, 01:20: PM

Expert Answer:

The cost of 6 balls is Rs 42.

We know that as the number of balls increases, the cost increases. Thus, they are directly proportional.

Let the cost of 10 balls, 15 balls and 20 balls be x, y, and z respectively.

 

Quantity 6 10 15 20
Cost (in Rs) 42 x y z

In case of direct proportion, the ratio of the two quantities remains constant.

Therefore,

On solving, we get,

x = 70

y = 105

z = 140

 

Thus, we have:

Quantity

10

15

20

Cost (in Rs)

70

105

140

 

Answered by  | 2nd Sep, 2015, 03:20: PM