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

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

## Application Videos

- kase pata chali gaa Kon lnverse or directly hai
- Complete the following table if x and y vary directly. x 2.5 b 1.2 1 y c 55 a 40
- Quantities u and v vary directly and when u = 12 and v = 16. Which of the following is not a possible pair of corresponding values of u and v? (i) 6 and 8 (ii) 15 and 20 (iii) 18 and 22.
- A car covers a distance of 60 km in 30 minutes. How long will it take to cover a distance of 240 km?
- The perimeter of a square is given by p = 4s where p is perimeter and s denotes the side of square. Does the quantity p and s vary directly? If yes make the table for s = 3 units, 5 units and 7 units.
- An agent receives a commission of Rs 45 on sales of Rs 1500. How much commission will he get on sale of Rs 1000?
- If the weight of 5 sheets of paper is 20 grams, how many sheets of the same paper would weigh 1 kg?
- In the following table, find the value of a and b if the quantities x and y are in direct variation. x 9 12 b y 27 a 75
- Check whether x and y vary directly or not? x 3 4 5 6 y 15 20 25 30

### Kindly Sign up for a personalised experience

- Ask Study Doubts
- Sample Papers
- Past Year Papers
- Textbook Solutions

#### Sign Up

#### Verify mobile number

Enter the OTP sent to your number

Change