A, B and C enter into a partnership by investing in the ratio of 5 : 5 : 8. After one year A additionally invests Rs. 4900 and B withdraws Rs. 3700. Now, the ratio of investment changes to 5 : 4 : 7. What amount did A invest initially? (in Rs.)

Let initial investment of A,B,C be 5x,5x,8x respectively According to the question after 1year A's investment=5x+4900 B's investment=5x-3700 Now use the ratio concept 5x+4900/5x-3700=5/4 From this we get x =7620 So A's initial investment=5x =5x7620=38100Rs.