Rice at Rs 80/kg is mixed with rice at Rs.40/ kg in a certain ratio such that by selling the mixture at Rs.60/ kg profit of 20% is made. If the quantity of 1st type of rice is 75 kg, find quantity of 2nd type of rice?
S.P Of the quantity = Rs.60/kg C.P of the quantity = 60/120×100 =Rs.50 Now ,Solve with Allegation 
Quantity for 1st = 75 kg Therefore, Quantity for 2nd =( 75)/1×3 = 225 kg.
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