Compound Variation | Maths | Direct Variation | Inverse Variation |Unitary Method| Arrow Method|Root

This video describes the Arrow method used to solve the questions having compound variation with an easy approach.
It includes 3 sums.
Q1:
25 bags of wheat each weighing 50 kg cost Rs 10000. Find the cost of 35 bags of wheat, each weighing 40kg.
Q2:
If 18 carpenters can make 900 boxes in 10 days, how many carpenters will be required to make 660 boxes in 12 days?
Q3:
3 pumps working 8 hours a day can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?

If anyone has any doubts in any of the questions regarding this topic,compound variation then kindly write the same in comments. I would upload a new video of its solution.

[root_thesolution]

Q1 answer is 11200 instead of 2800.
( multiplication with 4 is skipped )

[vedanshmishra]

thankyou so much mam
it helped me alot :}

[VandanaKumari-wodt]

Mam but in first question the multiplication is wrong.the answer is 11200 instead of 2800