Given:
For Rs. 600 , 520 mangoes can be bought.
Hence No.of mangoes for 1Rs. = 600520
For Rs. 1500
=600520×1500
=6520×15
=260×5
=1300
For Rs. 1500 there are 1300 mangoes bought.
Alternate Method:
520:600 :: x:1500
600520::1500x
x=520×6001500=1300