P5/P6 Math: A Total of 3 Given with Equal Ratio at the End

This question type starts with a known total of 3 parties.
Each party undergo either a fractional decrease or value increase/decrease and all 3 parties ends with equal ratio at the end.

Such questions are common in Paper 2 of P5 and P6 exams.
Calculator usage is allowed.

Derrick, Lawrence and Patrick had $3025 altogether at first. 
After Derrick spent 5/7 of his money and Lawrence spent 1/4 of his money 
and Patrick spent $155, each boy have the same amount of money left. 

How much did the 3 boys have altogether at the end?


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