CBSE Class 8 Answered
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 | 02 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 | 02 Sep, 2015, 03:20: PM
Application Videos
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Direct Proportion
This video explains the concept of Direct Proportion.
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