K and L started a business by investing Rs. (q + 900) and Rs. (3q - 1800), respectively. If K's profit share was Rs.27,000 out of a total profit of Rs.63,000, then find the amount invested by 'L'.
ATQ, Ratio of profit shares of K and L = 
Profit share of L = 63000 - 27000 = Rs. 36,000 ATQ; 
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