Question

920? V
of the cost of pens is 420, then what is the cost of 20 pens?
Rajeev purchased 6 calculators at the cost of 690. How many calculators can be purchased from
3.A labourer gets 860 for 12 days work. How many days should he work to get 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 360. What will be the cost of 15 kg of sugar?​

Answer 1

Answer:

1. 300rs

2. 8 calculators

3. 18 days

4. 520 km

5. 675 Rs.

Explanation:

1. the cost of 28 pens = 420 rs

the cost of one pen = 15 rs

the cost of 20 pens = 15 ×20= 300 rs

2. At ₹690 Rajeev bought 6 calculators

At ₹1 Rajeev bought 6/690 calculators

At ₹920 Rajeev bought 6/690*920=8 calculators.

3. As it is a case of direct variation so

Take no. Of days he had to work to get rupees 1290 as x

Then,

860/12 = 1280/x

X =1548/86

x= 18

4. 7 litres of petrol=280 km  

1 litre of petrol =280/7  

=40km

13 litres of petrol=13×40

=520km

5. 8kg = 360  

15kg. x.?

15 x 360 / 8=45x15 = 675

Cost of 15kg of sugar Rs 675

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