Question

WITH FORMULA AND COMPLETE ANSWER BEST ANSWER WILL BE MARKED AS BRAINLIST AND WRONG ANSWER WILL BE REPORT
2.At a party 8 packets of chips are served for every batch of 5 student how many packet would we serve if 40 students were present in the party ?

3. the amount of extension in elastic spring varies directly as the weight hung on it. if a weight of 150 gram produces an extension of 2.9 CM then what weight should produce an extension of 17.4 CM ?

4. a person at a speed of 72 km per hour travel by car from Delhi to Chandigarh in 10 hours. what should be the average speed of the car so that the person can complete the journey in 8 hours.

5. the weight of 45 books in 9kg.
(i) what is the weight of 80 books.
(ii) how many books will weight 10.8 kg.

6. 15 boxes each containing 18 juice cartons cost ₹5400 what is the cost of 22 boxes each containing 14 juice cartons.

7. 28 pumps can empty a reservoir in 18 hours in how many hours can 42 such pumps do the same work .

8. a contractor who had a workforce of 630 persons undertook to complete a portion of a stadium in 14 months he was asked to complete the job in 9 months how many extra person had it to employ.

9.a hostel had rations of for 60 days for 500 students after 12 days 300 more student join the hostel mess how long will the remaining ration last .

10. a man Travels a certain distance by train in 4 hours and 12 minutes at the speed of 44.8 km per hour how much time will it take to cover the same distance if the speed of the train is increased to 58.8 km per hour .
​

Answer 1

Step-by-step explanation:

for 5 students 8 packet ofchips are served

for 1 student 8/5 packets of chips are served

for 40 studenta we will serve 8/5 ×40 ie 64 packets of chips

extension 2.9 cm- weight 150 gm

1cm= 150gm/2.9 cm

17.4 cm= weight of 900 gm

speed is 72 km per hour time taken 10 hours

to complete the journey in 1 hour speed=72/10 ie 7.2 kmph

to complete journey in 8 hrs then avg speed= 7.2×8=57.6kmph

45 books weigh 9 kg

1 book 9/45

then 80 books weigh 16 kg

9 kg=45 books

1kg=5books

10.8 kg=5×10.8 ie 54 books

270 juice packs cost 5400

1 pack costs 5400/270ie 20Rs

308 juice pack costs 6160Rs

28 pumps in 18 hours

1 pump=18/28

42 pumps=27hours