52 packets of 12 pencils each, cost Rs. 499.20. Find the cost of 65 packets of 10 pencils each.
52 packets of 12 pencils will contain =52×12=624 pencils
And 65 packets of 10 pencils will contain =65×10=650 pencils
Now,
624 pencils costs =Rs. 499.20
1 pencil will cost =Rs. 499.20624
650 pencil will cost =Rs. 499.20624×650
=Rs. 520
Hence, 65 packets of 10 pencils each costs Rs. 520