Question

Exercise 8.2
1. If the cost of 28 pens is 420, then what is the cost of 20 pens?
2. Rajeev purchased 6 calculators at the cost of 3 690. How many calculators can be purchased from 920?
3. A labourer gets * 860 for 12 days work. How many days should he work to get 3 1290?
4. A car travels 280 km in 7 litres of petrol. How much distance will it cover in 13 liters of petrol?
5. The cost of 8 kg of sugar is 2 360. What will be the cost of 15 kg of sugar?
6. If cost of 13 litres of milk is 650, find the cost 22 litres of milk.
1. If the cost of 25 cricket balls is * 1500, find the cost of 45 cricket balls.
8. Gopal earns 520 in 8 hours. How much does he earn in 11 hours?
9. If the cost of 4 kg of cheese is 1920, find the cost of 12 kg of cheese.
(10) If the cost of 15 packets of biscuits is 480, find the cost of 70 packets of biscuits.​

Answer 1

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1. If the cost of 28 pens is 420, then what is the cost of 20 pens?

➜ Cost of 20 pens = 420×20/28

= 300 Rs

2. Rajeev purchased 6 calculators at the cost of 3 690. How many calculators can be purchased from 920?

➜ Step-by-step explanation:

Since we have given that

Cost of 6 calculators = Rs. 690

Cost of 1 calculator is given by

690/6 =115

We need to find the number of calculators from Rs. 920.

According to question, we get that

920/115=8

Hence, there are 8 calculators purchased from Rs. 920.

Answer 2

1. If the cost of 28 pens is 420, then what is the cost of 20 pens?

➜ Cost of 20 pens = 420×20/28

= 300 Rs

2. Rajeev purchased 6 calculators at the cost of 3 690. How many calculators can be purchased from 920?

➜ Step-by-step explanation:

Since we have given that

Cost of 6 calculators = Rs. 690

Cost of 1 calculator is given by

690/6 =115

We need to find the number of calculators from Rs. 920.

According to question, we get that

920/115=8

Hence, there are 8 calculators purchased from Rs. 920.